Same shims are used in several other bikes. Honda, Triumph, Yamaha FJ1200. I dont remember but if you put it in a search on E-bay, usually it comes up with which bikes it fits. I think I gave $6 or something for last ones I had to buy. I got a bag full of them in tool box. Unfortunately a bunch are the 300 range or something unless its a new head, I'll never use. Lucky for me the Victory is Hyd lifter.
I was able when I did my RSV to check them all, the ones that were out of spec I pulled the shims out to see what was in to figure what I needed. I was able to swap a couple around and only had to actually purchase 2 shims I think.