Will I be able to put FSK 155s on my MSP 187s?

It'll take some hardcore skillful brake bending. Rossi brakes are kind of annoying to bend, I don't know if it's the metal or what... So... If you don't know what you're doing, no. If you're LukeVicious, yes.
 
Putting them back together is tricky. Make sure to put the metal base plate back on first and then push the spring in place...it's much easier, but still a pain in the arse.

Also, when bending the brakes in a vice, BEND SLOWLY!! I fucked up and broke two brakes and had to find a replacement pair, which was no small feat.
 
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