EMPI 21-7040 VW AIR COOLED, BUG, SAND RAIL, CYLINDER SHIM SET, For 90.5-92mm Barrels .030", Set Of 4 Set Of 4 .030" Thickness Clearanced For 8mm And 10mm Head Studs Compatible With Mahle, NPR And AA Brand Pistond Ideal For Hi-Performance Engines