My rear brake calipers pins are not shaped the same one is straight and one has several ridges.My question is does it matter witch position their in.

There is a difference. The original brake pads had one mounting hole larger than the other. Most of the ones you can get now have both holes the same size.

I don't know why it was done that way. I don't know what difference it makes.

Eric Shea will know if anyone does.

--DD

I looked on the PP tech tips and there is a picture of the pin positions.
Thanks

You could try to put them in the wrong way and see what happens.