Small Block Mopar Windage tray bolts

jeff alder said

Set Of 4 69-70 NOS MUSTANG BOSS 302 WINDAGE TRAY MAIN BOLT C9ZZ 6345 A ORIGINAL | eBay

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These appear to have the threaded spacer welded to the top of a standard head bolt. I can think of two or three ways to accomplish that with a standard Mopar head bolt that would have minimal effect on the strength of the bolt.