I have a set of ER-50 Retracts and 3 30mm stroke lado-tech Edoors w/ Lado Programmer. I purchased these from Ladotech and electron retracts:http://www.electron-retracts.com/products/retracts/er-50.html & http://www.lado-tech.net/en/e-doors/24-gear-door-30mm.html & http://www.lado-tech.net/en/rs666/22-programming-card.html
All items are brand new, never installed, I tested the gear doors and the retracts and they are working and very strong. The ER-50 can handle up to 88lb aircraft and they are very fast for electric gear.
NOTE the ER-50 version I have does not have built in Tiller Steer, this is built for planes that have there own steering mech in the strut like on the UL.
here is a video of them inside an Ultra Lightning:
The shipping form Europe was ridiculous, but these aren't available readily stateside.
If you buy both I'll do $600.00 shipped + 3% for paypal fees.
NOTE: If you are wanting to convert an ultra lightning I have the mains and nose gear that I can sell for $250.00 they are in excellent shape.