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Yes, its the same. If you get the pattern 400N headlamp from M&P it will fit. Furthermore, the rim is the same profile, unlike the superdream ones. You'll have to put some bullet connectors on though, or solder the wires from the old one.
I thought the 400N was the Superdream Mike?
It is. What I'm getting at is the rim profile is different on the 250N, 400N, superdreams but the pattern ones look like the 400four ones. Phew.The reason I changed mine is the original 35W gives such a poor light, whereas the superdream one is a H4 halogen, 55/60W
i do indeed have the cibie adaptor ring but the cibie unit is bigger than 5 3/4 ".
i'm wondering now if I should just try to get a cibie unit again.
Many thanks Chris, if the original is 5 3/4 then it won't fit the Cibie rim.