GT550 ZORSTS - Are the Inner/Lower Mufflers all the same?

[Indy550]

One for the Indy clan -
I need to replace both inner mufflers on my 74 Indy (date of manufacture July 74). I believe the current zorst system is the original fitment.

Have been offered a pair from a 75 M model (date of manufacture December 74). Are those suitable for the 74?

I only ask cus the part numbers changed between 74 and 75 (74 = 34001, 75 = 34610) so wondered whether the shape, dimensions, 'cut-outs' or hangers were changed between the models?
Cheers. Chris

[slosher]

Chris
The lower pipes should fit the change from "L" to "M" was joining pipes at the headers not sure about any changes with hanger position though therefore i would have thought you shouldn't have a problem

[Indy550]

Cheers Slosher.
Well, I've bought'em now so see how we go!! I reckon if the frame didn't change between L & M then we might just get away with it.