The clevis that is offered by most venders is shorter than the original. I was missing one and bought one from Classic Parts. It was over an inch shorter. At first I didn’t think it was going to work until I found that the single rod going to the front was also adjustable. I was able to adjust the front rod enough to split the difference and get both the short and long (original) clevis to work. I have since got a replacement original clevis that I plan on installing it, bringing the emergency brake assembly back to original. Still looking for a suitable replacement for the boots.
My suggestion to you is post in the “Truck Parts Wanted” forum and see if you can get an original replacement.
1952 Chevrolet 3100 Project Journals ‘59 235 & hydraulic lifters “Three on the Tree” & 4:11 torque tube 12v w/ Alternator