I can tell you one combination of Pit Bull and R&G spools that don't work as I hoped.
I bought a
forward arm Pit Bull stand for spools as shown above for two reasons: 1) save space in the garage while working on the bike, and 2) hoping I could stablize the bike better by myself by being centered with the bike while holding it upright.
I bought the
R&G offset cotton reels thinking I'd get additional protection around the chain and sprocket as well as lower spools for greater lift.
Unfortunately, the spools are so far back that the axle between the wheels of the lift stand hit the rear tire of the bike before getting the spool receivers close enough to the spools. This just doesn't work.

I've raised the spool receivers as high as they can go, and even if I could get them to engage it would lift the rear so high the bike would be unstable or much higher than the front stands when both are used. If I lower the receivers and use the wheel stand from the rear, the spools are so far to the rear it also makes the bike unstable to try and steady the bike upright and lift by yourself. $hit.
My other problem is I had hoped to use the same spools in the offset arms OR in the pre-drilled holes in the swing arm. The bolts work, but there is no spacer sent with these spools. My observation is the hole in the swingarm is placed in the flat area cut for the axle holder but so close to the fatter raised areas of the swingarm that the back side of the spools are only partially supported by the uneven high surface of the swingarm.
Can any of you that have the regular R&G spools tell me if a spacer is provided to make sure the back side of the spool is on a more solid surface and the bolt tightened evenly?
Thanks