I would like to try some notched high lifts (or catching flat blades as you call them) for my 60" XR7 deck but Hustler doesn't seem to offer any, only the high sail flat blade (fusion). What size center hole does the 60" XR7 have and mabe I can try a different brand if you don't make them. I think they are 20.50" long. Trying to get a little more lift than the Fusion high sails have. Thanks.