Just in case anyone is wondering, you need to replace the whole cap if you want to swap them out. These screws are not available separately.
On a side note, the K5 is like a bull (trying to buck you off) on the MX track especially if the suspension isn't setup properly. I don't remember it being this drastic on the other MX bikes I've had, but then again they didn't have 70 horse either. It has the stock springs and I will be changing those out soon to match my weight (185). Hopefully I will get another crack at the MX track before they close for the season.