I'm installing the rear bumpers on my 58 and realized that when I had the frame powder coated they did not protect the threaded holes that hold the curved "I" Beam brackets.  I need to run a tap through the two threaded holes on top of the frame on each side.  They are 3/8" holes, but I don't know if they are fine or course thread.
							
						
					58 Rear Bumper Bracket
				
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