B219 loaders had a nomenclature plate or sticker (depending on the vintage) on the inside of the left upright. Some were painted over, some are outright gone, but worth checking.
I agree with NIW, your local shop can rebuild them for about the same or maybe a little more than the price of the Kubota kits, if they are still available.
If it is a B219, they are all standard US size seals/o-rings, no metric.
Helped another guy with his, he wanted to rebuild them himself for the experience, so we disassembled & cleaned one cylinder (all four are the same) and took it to a hydraulic shop. Took them about 10 mins to pull & measure everything, put together a package with four sets of seals, and it was about $60 for everything.