The hanger is the best on the market for 1-3/4 " wide springs, and it requires a nylon bushing which was not included, mentioned or offered.
The hole size on the hanger is much larger than 9/16"; however, once the required bushing is installed, the hole is about 9/16". I use a 9/16" greaseable bolt with this setup, and it works perfect, and is serviceable. I do not like the typical metal on metal contact of other rear hangers. Worth the money all day long, and Pacific is the only carrier of this part as far as I know.