OEM STYLE 7/16" U-BOLTS FOR 7.25" HOUSING

HI. I am replacing drum to drum with a similar unit and need factory style U-bolts. These would be a set of 4 with washers and deep nuts. Dimensions are curved end, 2.5" I.D., approx. 6 to 6.5" length, with 2" of fine (20) threads on each end.
Does anyone have sitting around - or a trusty link that can help? I have gone thru Ebay and many private sources with no luck. Aftermarket would have to be (at least) a Grade-5 but prefer Grade 8. Thanks for viewing.