Used on w/sl engine, aircraft, f-108 (cfm-56, kc-135a); engine, aircraft tf33-pw-102 (c-135e, ec-135h/k/p); aircraft, awacs, e-3a; engine, aircraft tf33-p-3/5/9 (c/ec-135, b-52h); aircraft, c-18a, ec-18b; aircraft, galzxy c-5; engine, aircraft, tf-33-p-7 (c-141a/b); joint stars target radar system. 23 each bolt holes 0.281 inch dim irregularly spaced on a center line 0.500 inch from the outer edge.the gasket material is braided aluminum wire oval