Grace 707 owner of 48 (!) years here. I owned a Grace F9E and F9 Ruby back in the early 1980’s.
The Grace F9E most definitely works with this tonearm. I could never get the ruby version to no sound bright and hard in my system (bi amplified Dahlquist DQ10’s at the time with AR SP6B and C-J MV75A and Ampzilla amps with double subs). I think the ruby cantilever has kess compliance than the aluminium F9E.