As far as I'm aware RS will only sell to business or company's. So I don't think I can go down that route. Thanks for the replys, yes I know the pin socket size goes up in size to accommodate larger currents. I put the TO218 transistors up to a pc power Molex connector and it's way to big in socket size. Although the pitch is perfect. The Molex 2.54 mm socket is the one that fits like a glove, although it states up to 4 Amps on the Molex company website page. The Molex 5.08 still retains the friction fit, and the pin pitch is perfect. There rated up to 7 Amps, I've not got one to offer it up to the transistors legs to see fit and finish etc. I probably have to go with the Molex 2.54 mm socket because it's easily available. Unfortunately the Molex 5.08 mm socket seems a bit elusive in the friction fit version. The pc pin and socket version is readily available, but that's way to large in socket holes. It looks like there's two versions of the Molex 5.08 mm system, one the friction fit, and two the socket pin fit. Thanks again for all the help.
Straight solder up is the quickest option, and can handle all the current. I was just looking for a quick swap out interface idea.