Cheers Andy, when i flip them they go like you say. the shock bracket faces out, then RS15 is about 25mm back to allow it to mate with SB2.
But the bolt holes are not central on the plate, this is what i might have messed up. Across the plate you come in 35mm have a hole, then another 70mm have a hole. then it should be 45mm to the other edge of the plate. 150mm in total.
I take it the 45mm gap is towards SB2? when plate is right way up to be mounted
Sorry, I dont know ive made this so complicated!!