D&R Clevis #4 is 5 1/2″ from Face of Threads to Center of hole, Using Combinations of 1-1 or 1-2 or 1-3 or
1-4, you will be able to Achieve Center to Center Dimensions of 22 1/8″ to
Clevis #4 is the Standard Clevis used for a D&R Chassis.
Picture shows the different sizes of the combinations.
There is 1″ worth of threads on each end of the rack so you can adjust it.