U bolts question (TSB u-bolts & OEM u-bolts)

I've searched and searched fellas and i can't seem to find anything on the length difference of the TSB u-bolts vs the OEM u-bolts. From what I've searched people assume the TSB u-bolts are longer. It's somewhat a safe assumption considering that it's a 4 leaf spring pack vs 3 leaf spring pack for OEM. Reason I'm asking is because I'm taking the spacer kit off my 2nd gen tacoma and no longer have the old u-bolts. The dealership charges a finger and toe for some new ones so I was going to have a driveline shop custom make some for me......stronger, better and cheaper. This maybe useful info for others too so any info is appreciated. I know they're 2.5 wide and 1/2" bolts......but what is the length difference between TSB and OEM.....If there is any?