sourcing CB 750 K2 1972 clutch plates

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Hi,
Re my 1972 CB750 K2 (USA imported bike)
Can anybody recommend an aftermarket source for a set of friction plates vertical groove type.  Most seem to be the type with the angled groove.  OEM friction and steel plates are like hens teeth now to get hold of and  the price of a gold bar.  David silver alternative version friction plates seem to be the angled type.  As do CMSNL.

EBC friction plates look vertical grooves from the picture, but are listed as heavy duty plates?  does this mean they are thicker.  Or is does the word heavy duty relate to the material being harder?  Does that not mean more drag when the clutch is disengaged?  which I'm trying to avoid.  The clutch is apart because the bike has been standing, the clutch does not free enough and I can't get back into neutral when the engine is running.  All tolerances are within spec however, so I was just going to put new friction plates back in. 

I might change the steel plates,  but the aftermarket steel plates do not look from the pictures as though they have the many tiny detents in them ? does this not make a lot of difference ? I assume they are designed to retain some oil.

Has anybody got first hand experience of fitting either the angled friction discs in place of straight cut ones and none original steel plates without the tiny detents.  Does it really make a lot of difference.  Hondaman seems to think it does, but maybe things have changed over the years and the angled ones are the ones to fit now. 

Thanks any thoughts appreciated.

[Trigger]

EBC CK1133 as long as it still has a K2 basket fitted. Steel plates, just clean up with a copper wire brush 

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Hi trigger. 
Yes the EBC ones seem to be the only ones that do not have the angled grooves between the pads.  Whether angles makes any difference anyway who knows.   
As for it being a K2 basket I can only assume that it is and that the hub and pressure plate are correct for the basket.  Bike chasis number is above 2000000  However it looks as though the K2 and K3 basket part numbers and hub are the same anyway unless I got that wrong. 

To me this looks more like the CMSNL K3 parts layout.  just 7 friction plates with vertical grooves and 6 steel plates.  Springs with a dash of yellow paint on them.
I have no washers under the 4x  clutch springs?  where they seat on the hub and no wire ring stopper or differnt size steel clutch plate A as mentioned in the K2 parts diagram. 

I think EBC 1133 states it fits K1 K2 K3 K4  ?

Its very confusing and hard to double check as you know, no part numbers on the clutch basket hub or pressure plate.   

Thanks

[Trigger]

Angled plates are for the later 750's, which has a different basket fitted.

You must be careful of any Hondaman comments as a lot of info is general and may be for a later bike or early bike. I did have customer that had drilled holes in his clutch to release oil while it spins. He said, that he had got the info from hondaman but, Honda man was on about a modification to a clutch that was fitted to the very early 750's and not his F1 which already has the holes from the factory.

And never assemble a clutch from a CMS parts layout. It is just a general picture when it comes to 750's 

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Thanks trigger, yeah understood.  yes I was just using the CMS parts thing as a reference to try and explain differences. 
I try and triple check every bit of info from all sources.  It always takes longer to source the info than do the job.  The biggest problem ever on old or later stuff is finding correct tech info for bikes or car work.  Nobody said it was easy though ha ha. 

David Silver show the angled friction plates for the K2 (if the picture on the web site is anything to go by)  so I don't necessarily trust their aftermarket choices either.

I will get some new EBC 1133 friction plates and refit the cleaned up steel plates.  My ultrasonic tank did quite a good job on them initially but fine scotch brite brought them up well.   Where is the best place for EBC   M&P / (demon tweeks ebay) ? 

My clutch basket setup would appear to be the same as a K3  I believe.