The Repro ones they all sell I think are made by EIS in the states, they are not great and to make matters worse the last one I had from heritage didnt come with any wiring guide and they have changed all the colours around, god knows why. Ended up rebuilding an old one as it was going on a 72 which is different again, only has 5 wires. I've got one on my bus and fitted them to other buses so they do work but its not as straightforward as it should be.
If you want that one James happy to do a good deal with you since you helped me out recently?, could bring it with me tomorrow night and see what you think?