Mr. Gasket Header Bolt - 3/8-16 in Thread - 0.75 in Long - Hex Head - Polished - AMC V8 / GM V8 / Mopar B / RB-Series - Set of 12 H778C42M This one has a steel

This one has a steel housing and clamp rings

1/16" thick

A direct replacement for all 1957 Chevy passenger cars with six-cylinder engines

05 in Piston Throwout Bearings

•40% lighter than previous offering

Mr. Gasket Header Bolt - 3/8-16 in Thread - 0.75 in Long - Hex Head - Polished - AMC V8 / GM V8 / Mopar B / RB-Series - Set of 12 H778C42M This one has a steelMr. Gasket Header Bolt Set 2210G 3 8 16 x 0. 75" Stainless Steel 12 pc. Header Bolt Set Quick and Easy Installation Heat Treated For Strength Ideal For Tight Spaces Grade 5 Material Protective Black Finish Applications include: Bel Air, Biscayne, Blazer, Blazer K5, Bonneville, Brookwood, C10 Pickup, C10 Suburban, C15 Pickup, C15 Suburban, C15 C1500 Pickup, C15 C1500 Suburban, C1500 Pickup, C1500 Suburban, C20 Pickup, C20 Suburban, C25 Pickup, C25