I'm converting from manual to power top.

Is there anyone making the power top relay? Any parts interchange?

I wasn't aware that there was one. The older convertibles did not have a relay. The later convertibles use two relays, which is what I used along with the switch in my son's Dart since we didn't have the correct switch and I wanted to put it in the console anyway.

the pumps are pretty much the same into the 90's lebaron.

the old ones orginally only had a circuit breaker under the drivers kick pannel.
power came directly from the amp meter.

I took that circuit out and ran a new larger power line to a distribution block behind the seat and wired up 2 relays(well 3, one for a fuel pump) and used the original wires to send signals to the relay's.
you can even get the trailer plug kit from pep boys and plug it in directly so you don't have to cut either end of the pump.

I used the entire wiring harness from a LeBaron that we parted out. I've got the same setup for my Barracuda. It just makes it easier that way...