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Try www.broncograveyard.com They usually have things like that, and IF you can't find it there try LMC-Truck.
I think I've seen chrome dipsticks and tubes in summit and Jegs catologs, but not 100% sure if they had them for your application.
I made one using 3/8" (I think) brake line and a dipstick from a 302. It fit perfect in the fitting through the oil pan. Some models had it going through the block, but it should be the same size.