I am building a Mx Bonanza with a H70 with a TAV and needed tall plates. Scooter boy made me a super nice set of plates. After I got the plates I had a templete from a member of tall bonanza plate and realized the swing arm hole is lower. So I used the old copper plate on the back and plug welded it closed and drilled a new hole.The 5/8 hole was easy to drill and the plates look great.Thanks to scooterboy for the plates they saved me hours of work.