overdrive tranny

I am putting a 223 inline 6 with manual shift overdrive trans from a 55 ford in my model a sedan, but I want to convert to 12 volt, does anyone know where to get 12 volt solenoid and relay for my transmission. thanks in advance for any help.

 

Try:

http://www.fifthaveinternetgarage.com/

They sell the 12V solenoid and relay (as well as other 6 to 12v conversion items). you didn't mention what kind of tranny, but I have a Borg Warner T96 in my Studebaker and I got my stuff from them.