Fitment:Works on all 1937-1948 car and 1937-1947 truck spindlesBrake kit fits 1937-1941 round back style spindle with zero modificationsAlso fits 1942-1948 square back style spindles with minor grinding of the spindleThis kit works with both cast in and bolt-on steering arms without issueWorks perfectly with Speedway Motors spindles which utilize 1937-1941 round back stylingDisc brake style wheels are required for proper caliper clearance when upgrading from drum brakesSingle 2-3/8-inch piston GM-style “Metric”calipers use commonly available replacement padsStreet friendly organic brake pad compound for long pad and rotor lifePerformance brake pad upgrades available separately for those wanting increased stopping powerIncludes everything you need t.