We are so anal we drilled and tapped our half holes in the bushing last year for my 340 Jag. We also rigged up a deal to install the bushing absolutely straight using a home made tool the right diameter and a big Dake Arbor press. So far, 250 miles later, no problems. This bushing was one of the rare fiberglas/plastic HD jobs that you can't get anymore. The white stock plastic ones sold in the Hiperf Eng catalogs can run sloppy in clearance specs. Some day I want to find the original HD material sold to racers in the mid 70's and make a set. But when you take one of these apart, take a Sharpie and mark what came off what so it all goes back the same way, for balance. Some times the casting marks are hard to see so I like a second set to double check.