ey man by racing seats im assuming u mean a full bucket seat.
if u go to autobarn, they should have rail adapters that they can order in for you..what you do is u connect one side of the adapters to the seat, then u align the seat onto ur stock rails, drill the holes and bolt em in and bam ur done....but...in regards to custom rails i got no idea..but good luck with it bud =]
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