Hi Justin,
You can have this vintage XT fd for shipping if you want it, I'm guessing around $15. 34.9 clamp which I'm 95% certain is what your bike takes, maybe someone here can confirm.
Low-mount clamp, bottom pull (normal stuff that will work on Rivs). It will shift your cranks fine, just remember to mount it with some clearance to the trouser guard..it's a triple derailer on a triple crank, both were designed with a big ring in mind but that has been replaced with a guard that isn't much bigger than the middle.
I can send more pics that show you what the heck this is, this pic is weak.
Joe Bernard