Curious about the specific fork differences between years/models. I know that the later models had 35mm diameter tubes and earlier ones were 33. Although mines an 82 with drums and the forks are 33 diameter. I am switching to discs, it's a pitty my forks aren't rusted at all but I can't use them. What I am trying to find out is how much longer are the special forks than the standard models? I've done my research about effectively shortening the special type and it seems that 2 in is about the most one would to shorten them. Will that get me close to standard length? Another question is caliper mounting. I didn't realize til I had already Bought a caliper that the 80' and after have a different caliper/ mount. I bought an 81 mag wheel with disc and caliper. Does the later version caliper bolt up to pre 1980 forks? Thanks for any help!