Porsche Wheel Adaptor Brake Pad Issue

Bought some spacer adaptors to put Porsche wheels on & didn't expect this issue in pics when test fitting . Wheel turns but gap is like a sheet of A4 so bit tight for comfort. Brake calipers are the Vauxhall direct bolt on type so 280mm discs can be fitted.
So either I swap the brakes out again or shave a couple of mm off the middle of the pad at the bottom. Any other suggestions? Perhaps another brand of pad will have less metal backing maybe than QH?

I would try a different pad, as I have never seen a pad that was wider than the Surface area of the rotor.

I would take one of the new to a AutoParts store and see what the difference is.

Yo may have gotten the wrong pad in the right box.

Believe thats a problem when doing the Vauxhall conversion.  .Had the same issue myself several years ago,  trimmed the pad short term,  bought g60 calipers long term…