Yes this is a kit to [partially] rebuild those 4 piston goldline "GP Billet" Brembo 30/34 calipers as pictured below.
Each kit is for 1 caliper and contains; 2 x 30mm pistons & seals plus, 2 x 34mm pistons & seals along with a pouch of Brembo installation grease. This kit is lacking the small oring that goes between the caliper half, as well as the secondary stepped piston seals. Although these are genuine Brembo items, they are not a readily available catalog Brembo part number.
NOTE: This kit is specifically for the racing "GP Billet" 30/34 calipers and are as supplied to Brembo sponsored racers that used those calipers. The pistons do not fit your OE calipers but the seals do.
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