Just bring in what you have and the owner will figure out what you need. At least, that's how it's worked for me.
If you go there, look to your left for East Texas Hydraulic. It's almost next door to Superior Fleet. That's where I get my hydraulic cylinders rebuilt. Most cost about $100 for parts and labor. I just drop it off and it's ready in a day or two. They do not take plastic, so bring cash or a check.
I don't know what it costs to rebuild a cylinder on a Branson, but the parts kits for a cylinder on my New Holland backhoe cost anywhere from $60 to $120 for the kit. Most of what's in the kit isn't used. The kit has everything for a variety of different cylinders, but you have to buy the kit to get the seals that you need. East Texas Hydraulic just buys exactly what you need. Usually it's under $10 in parts, so it's a no brainer to have them do all the work and make sure it's done right.