Aviaid makes nice pans for sure but I would dispute SAI using them until Ford’s efficiency experts over ran them after about mid 1965. There are many published articles on Ford getting deeper into SAI operations and putting in lower cost substitutions. Some like the 428 powered “427” Cobras are quite famous. In the SAI leaf spring chassis team fabrication and competition time original frame people that worked at SAI, including Mr. Peter Brock, say they made their own
oil pans. Period pictures have been published to illustrate the point. I tend to believe the people that did the work.
At one of the SAAC conventions in the mid 1980s, one of the SAI Team fabricators gave a talk where he described how their favored car lost its engine and hence the race at one venue because their fabricator forgot to descale the welds in the
oil pan after he made it. He described how flecks of rock hard weld scale came loose and made their way to the
oil pump and other critical places. He didn’t describe a pan from a supplier. He said one of their fabricators made it from a stock pan that came with the engines as they arrived from Ford.