they had some in between those originals & the indy 500, they said "firestone firehawk" on the side but had a small letter "ss20" on the sidewall too.
i had them on a car for a couple years that came off a parts car i got, they were old & hard but no cracking but still balanced out & rode better than BFGs, & the letters were bright white after all those years with very light washing.
same basic tread pattern for all the models, i have a set of older indy 500s on a car now & they are great tires in every way, easily as good or better than BFGs.
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