Anyone know the bolt dimensions that is used to secure this special washer and U-Joint flange to the output shaft of my SM420? The Grade-8 bolt which was there measures 3/4" long and had 1/2" x 20 fine threads. I am thinking that this will be too short now that I am using the proper thickness washer.

Thanks, Jim

1954 GMC 1/2-ton Longbed
1971 Pontiac LeMans Sport