Rallye wheel center cap screw mount holes

Hello! Dumb question here but looking for some advice. Just bought 4 of the later style large center caps part number 3461458 for my 75 dart. They are Mopar performance parts from summit. I think these caps need 5 small screws to mount them to the rim which is fine. They have 5 screw holes in the back but they are not threaded. All 4 of the caps are like this in every hole. Do the screws self tap when you put them in or do I need to tap these holes for a machine screw thread. (They did not come with any mounting hardware. Any advice is welcome. Thanks!

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