Holes spaced 3 in. And 4-1/4 in. Respectively from center of center hole
NSN 6620-01-497-3744
NSN 5915-01-381-9455
NSN 6130-01-227-7331
NSN 5998-01-509-2781
NSN 6105-01-464-4684
NSN 6110-01-432-2442
NSN 6240-01-252-9374
NSN 5855-01-512-1926
NSN 5915-01-202-8020
NSN 6105-01-525-0616
NSN 5965-01-443-3000
NSN 5910-00-427-5664