Moroso Steel Allen Head Plug - 3/8 in NPT - Chrome (4 Pack) 41011010 or if the thread pitch

or if the thread pitch is different from the eye bolts

These shock absorbers are available in a variety of lengths and standard digressive valve settings that utilize proprietary spring steel valve discs and can be converted to a coilover design (kit sold separately)

Mounting Flange Gasket Type - Standard LS3 Molded O-Ring

Bump Springs are used in conjunction with a primary spring to allow a race car to have a relatively soft / compliant initial spring rate to get down to the desired optimum ride height and then pick up the rate of the bump spring to achieve a constant / optimum dynamic ride height

1966-1968 Mercury Cyclone Base CID 289 Naturally Aspirated GAS

Moroso Steel Allen Head Plug - 3/8 in NPT - Chrome (4 Pack) 41011010 or if the thread pitchChrome Plated Pipe Plugs, 3 8" NPT, 4 to package Moroso Performance Products is one of the worlds most respected suppliers of automotive equipment for racing and street performance applications. Moroso manufactures over 4000 products, from oil pans and oiling systems, to ignition wire, ignition components, valve covers, fuel system equipment, air cleaners, hard core racing tools, chassis and suspension equipment and numerous other performance parts.