Yes, it was a mistake on my part. The new leaf spring is 5/8" I know that much. So looks like 4.5" and maybe even buy a 5" and cut it down to only have smooth part in the bushing?
Ideally I think it would be good to only have smooth part on the bushing. With the 5 inch bolt I bought I think 7/8 or all of the smooth part fit within the bushing without me doing any modifications to it.