A Kubota L/K650 came with my L185DT. I think it was about the same size as your L1500DT. One model uses tractor hydraulics, the other has a PTO pump & hydraulics. Get the one with the PTO pump...
I really don't recommend this backhoe - the stabilizers were crummy, and they ran a heavy bar under the lift arms to stop the hoe from jerking up and down as you dug - all it did was bend my lift arms. The swing arm mechanism uses motorcycle chains - I've broken a lot of them. And in the first year EVERY ONE of the hydraulic hoses blew. Booo....