Yes rich - measure that for me. Looks like 3/8x2.5 or 3. Metric likely has it somewhere in the middle. Where it bolts to the frame is that area undercut smaller than the bumper front? On mine if it's 3", it seems the pivoting of the axle could hit it.
Also, how wide is it across the front .. looks about 16/18". And while your at it .. lol .. check the distance from the frame to the bumper front.
Thanks a bunch!
RonB