seal-kit database/ cross-reference?

I'm looking to buy seal kits for these three cylinders, but seems suppliers are clueless about cross-referencing from cylinder number to seal-kit number. I can't remember how I did this before - I think I bought kits from local shop that looked the crosses up. There must be a database somewhere, right?

2ea BC50-3X34 (CAT307SSR blade cylinders, 2" rod, ~8-10" stroke)

1ea BCFO-3933 (CAT307SSR articulated-boom cylinder, 55mm rod? )

Thanks - Dave

seal-kit database/ cross-reference?