Swing arm differences

[joeleeman]

I've just picked up an earlier frame for my cr750 project. I have the k7 swing arm from my original frame which physically fits but fouls the passenger pegs. (Being cut off anyway) are there any length differences between the earlier and late ones? Or width?

[Bryanj]

Width differences at wheel end and mountings if it had a rear disc

[joeleeman]

Are they longer at all? As k7 had longer wheel base. I'm mainly concerned about  my wheels fitting an earlier swing arm as they're already been built

[Bryanj]

Not sure,  I know the head rake angle altered over the years which would alter wheel base but don't know about swing arm length