I am using Robart electric retracts in an SBD3 that I am building. They took months to arrive, needed repair before they were installed, took months to repair, ere wrongly labelled on their return from Robart and customs held them for weeks wanting duty again. Eventually, I sorted that out and then found that they did not quite fit my plane. They were specifically sold for that model and designer by Robart. I can say in all honesty that I regret purchasing them.
I wish you betterr luck with them than I had.