so about those new US indy slotted mags...

im thinking of finally buying some new wheels, retiring the terrific looking 14X10s with N50s, and going with some 15X8s
(im running a stock 8.75 with small bolt pattern...anyone know what backspacing i need for my 71 duster)

MHT U10115805445: U101 Indy Cast Aluminum Wheel Size: 15" x 8" | JEGS

now the "problem" is they only seem to offer them in a polished version, which wont match the fronts (im planning on keeping the 14X6s there) and i just plain dont like the look

has anyone been able to get US mags to get them a non polished set, or found a way to return them to the way cooler looking dull, as cast finish?