Ah, PK - Parker-Kalon - used in aviation / sheet metal working. Never heard of them. Not sure any slot car makers use them.
Anyway as Pressbuttons says, diferent slot car manufacturers, different years, pozi drive, phillips, flat blade, metric, imperial etc - so many different combinations. You only have to look through my box of spare screws (or in the slots of Daves track) to see how many different types are used. Was there any particular cars you were referring to?
PS Happy Birthday by the way, hope you got what you wanted, if not hope you got some slot cars
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