You should be able to buy something like a head stud in about any length and thread size. You could probably use a sleeve in the frame hole as long as the sleeve is sandwiched firmly between a shoulder and nut/washer.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
