Basically, almost anything can be ‘massaged’ to fit. Not too difficult a conversion to do. @wraithand @TonyGeewill be able to point you in the right direction. And, welcome!
Well, I’ve got them free! But, which way are they supposed to come out of the preload adjuster? They’ll only screw out a few turns, or screw in slightly below the top surface ... but that’s it! Won’t to right in, won’t come right out. Bugger!
Strip the rack down as much as possible, then dump them in a bucket of water for a week. You could throw a squirt of dish soap and lemon juice in too! Sounds daft, but it works. Be gentle with them … especially the float posts.
Couldn’t you have just made an o ring? And the OE price and shipping for that new res? Silly money! Get some sterilising fluid, used neat. Steep the old res. in it. That’ll whiten it up a tad!
Fact! There's an OE tool, much like a C spanner, that goes under the cam and locates on the edge of the follower. on rotating the handle of the too towards the head surface, the follower is depressed enough to remove, measure and replace the shim.