Is narrowing the O.L.D. of a Shimano hub by replacing the freehub possible?
I would like to put a more modern rear wheel, with 7-speed cassette, on a vintage Bottecchia (using friction shifting) but would prefer not to change its current 126mm dropout spacing.
I see that Shimano offers a 7-speed freehub body that is intended for the STX-RC and Acera-X.
Can this freehub replace whatever is on any 8/9/10-speed 130mm O.L.D. Shimano hub to narrow the O.L.D. to my preferred 126mm?
(I have a truing stand and tools for either building or redishing a wheel. This will not be a problem.)
According to what I've read, most all of the current Shimano freehubs are supposed to be interchangeable but I don't want to find out otherwise after I've started spending money.
Thanks in advance.