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phs1 has the same ratios as the williams off the top of my head
phs1 is JC5 089
willy is JC5 048
172 is JC5 129
late 172/182 is JC5 130
(all of the top of my head, so i might be wrong there)
they're identical discs, just the max have grooves cut in them
TBH the grooves don't really make a difference on those discs
the race cars ran plain discs, that'll do me (and i'm cheap!)