I took a rear spoked rim from a `77 Convert. and put it on my `81 CX100(LM II). It had a spacer with it on the left brake side compared to the mag rim I took off. I installed the CX mag rim on the same Convert. Haven't switched front rims yet but might. Already know the ID between the brake rotors are the same but the forks on a CX/LM II are wider than on a LM I.