Allstar Performance Aluminum Countersunk Washer — 0.25in ID x 1.25in OD, Natural, 10-Pack | ALL18664 1982-gmc-k1500-esi2899154 Must be used with one

Must be used with one of the following Injen intake systems (Model & Engine dependent):

When installing longtube headers on your 2018–2023 Mustang GT or 2018–2025 F-150

Proform For Chrysler 361-400 Engine 66183

and they've been manufacturing long and mid-length tube headers for Chevy trucks for nearly as long

Year Make Model Submodel 1998-2007 Toyota Land Cruiser Base

Allstar Performance Aluminum Countersunk Washer — 0.25in ID x 1.25in OD, Natural, 10-Pack | ALL18664 1982-gmc-k1500-esi2899154 Must be used with oneThis Allstar Performance countersunk washer is machined from aluminum with a countersunk profile that seats flush with countersunk screw and bolt heads. It measures 0. 25 in inside diameter by 1. 25 in outside diameter and 0. 168 in thick, finished in natural aluminum. This is the largest OD in the aluminum countersunk washer family and is slightly thinner (0. 168 in) than the smaller OD washers in the family (0. 188 in). This washer is sold as a set