I seem to recall that Alex is in Europe? in which case even though DS are cheaper than CMS after import duties and postage it may be cheaper to buy from CMS.
The alternative part is just a superceded part Alex, initially the part number ended in 005 which were Hitachi points IIRC but then they changed supplier to TEC and it became 154 instead. Both will fit but I'd go for the 154 points myself.
Can't believe how much CMS want for original points, I have quite a few sets so I'll be saving them for when DS increases his price, which he will as soon as he knows what CMS are charging now.