Suzuki 2 Strokes

I'm doing a full scale rebuld of a basket case GT500. I just found that the front caliper is the ASCO flavour (i.e. 77 GT550). Now I'm questioning the forks - is there an easy way to tell the difference from GT500 to GT550 forks? From what I can by overall shape/bolts they look pretty similar, but parts lists are giving me different #s, even for oil seals. Forks are off bike so if there are unloaded length specs or something of the sort to tell the difference, I'm fine with that.

Also wheel & brake disk - I would assume that the fork decision will lead me down the right path for disk & wheel, but again, is there an easy way to tell?

I'm guessing it was just caliper swap, but I want to be sure before I commit to buying parts (I don't have the money to waste on the wrong parts)!

Fork diameter? What are the 500 forks?

From what I have read, both are 35mm dia - so no help on that front...

Are they the same length? Don't take my word for it, but I have a feeling the 550s are a little longer.

I read that the 550's are a little longer, but without the two to compare I need a length # for one or the other against which to compare.

At a minimum - can anyone confirm if the oil seals are interchangeable?

http://www.alpha-sports.com/suzuki_parts.htm" onclick="window.open(this.href);return false;

Navigate to year then to GT550 and to GT550. Fork designs look completely different and the fork seals are not the same part number.

Cheers,
Mike