You can buy the Kubota BX rear remote kit for around $330. It is made for the BXs and is easy to install. I don't believe you can come close to $330 for after market remotes. However, both valves in the kit I bought leak through and the cylinder drops pretty fast. I have not yet talked to the dealer about the leaking problem. I am sure it is the valves because I installed a throttling valve to slow down the cylinder, and if I close the throttle valve the cylinder holds. I feel that I have two options; 1) to rebuild or replace the valves or 2) install a cylinder with locking check valves.
Good luck Googling top and tilt and finding any thing that will fit a Kubota BX. The cylinder I am presently using is from Surplus Center and is a 1 1/2" cylinder by 6"stroke:
http://www.surpluscenter.com/Hydrau...IC-CYLINDER-WOLVERINE-WWXT1506-S-9-8770-6.axd
I am looking at a locking cylinder from Haytools:
http://www.haytools.com/TNT.htm
The cylinder from Haytools only has a 4" stroke, but it appears to be in the right range for what I need.
So far no luck on a tilt cylinder. If I can find one short enough I will probably have to modify it to fit my BX2370. Having a locking cylinder on the tilt is probably not as critical as the top cylinder and I would probably just buy another throttling valve and just open the throttle valve when adjusting the tilt. With the top cylinder I want to be able to adjust it on the fly.