These (Twin Tech 24003) , (WIX 24003, 24744, 10429) / (NAPA 4003, 4744, 600429) style filter caps have (1 7/8" x 16 threads per inch O.D. thread) by (1/2" x 36 threads per inch I.D. thread). They are made form 416 Stainless Steel, use the same o-rings and are much more corrosion resistant and durable than the original aluminum caps. Weight 6.8oz. (193grams).
O-Rings sold separate.
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