Head stock is about 1" longer, that was second thing I measured after finishing with ProArm measurements, was trying to get the rolling chassis together so I can compare the MC18 to 21 with the Ohlins shock I was hoping to adopt, it fits but it seems too long still, had to compress it good 10 mm to get the ride height near stock MC18. I'm sure MC21 can take some height increase in the back, will get to it when I'm closer to finishing it, perhaps after a test ride.

I think the 21 yokes will be the easiest route, not that I'm afraid of making things, but I already found a lower yoke in US, just have to wait for the funds. I pressed Honda Fireblade stem in to Ducati 748 yoke to adopt a complete 748 front end to my Hawk, also had a sleeve made for the ProArm so now I have a complete rear eccentric, axle, brake, wheels and cush dive from 748 on my Honda

What is the length of the MC21 suspension link, the one from the frame to the triangle? Should I use MC21 or 28? I used a CBR one for now just to get the rear bolted on but it's 130 mm I believe, definitely longer then MC18

Yokes in the picture are CBR600, those parts are dime a dozen here, got a shock for $28 shipped, almost straight fit for MC18