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I looked in the illustrated parts book and it showed 7/16-20 x 1 1/4" for 53-55 but nothing for 48-52. I can measure mine when I get home from work if no one else answers first.
Well, I measured my original bolts and just like it showed in the illustration for the 53-55, 7/16-20 x 1 1/4". Two of the three are drilled at the threaded end for castle nuts and cotter pins. The lower forward bolt goes in from the outside of the frame and is the one not drilled. The other two go through the box ear and then the frame. Probably more info than you wanted!
Well, I measured my original bolts and just like it showed in the illustration for the 53-55, 7/16-20 x 1 1/4". Two of the three are drilled at the threaded end for castle nuts and cotter pins. The lower forward bolt goes in from the outside of the frame and is the one not drilled. The other two go through the box ear and then the frame. Probably more info than you wanted!
That's interesting, two of mine were drilled, one wasn't. I thought they were all drilled, and someone had replaced the one.
Well, I measured my original bolts and just like it showed in the illustration for the 53-55, 7/16-20 x 1 1/4". Two of the three are drilled at the threaded end for castle nuts and cotter pins. The lower forward bolt goes in from the outside of the frame and is the one not drilled. The other two go through the box ear and then the frame. Probably more info than you wanted!
I just pulled the same thing out of my 52 F2 steering box.