OEM brake pad question

[GSS138]

So I burnt through a set of MX-72's finally last weekend. Amazing pad, but they were toast after 20-30some track days on them.

The only thing I had available were my OEM pads, however, I noticed 2 things about the rear pads and had a few questions about them:

1. I noticed that on the rear pads, one of them has a small metal clip/marker. What is this for? I also noticed one of them is marked AP I think and one is marked AK or something. I am assuming one of them goes on the inside and one of them goes on the outside. Can you tell me which one? I know this seems basic, but I have never installed the OEM pads before and the my Endless MX-72's don't have this little metal piece.

2. ON my rear pads I only had shims on the outside pad. Is this normal? Am I missing 2 shims?


TY