I don't have any clear pics of the attachment, but I used U bolts. 130hrs and it hasn't budged. The holes line up perfectly. Just experiment a little. I know others have used adel clamps. I think I was the second one to use this mounting location. I copied another guy 
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John Walker
RV-10 N265WD
"Miss Whiskey Delta"
BPE IO-540, FULL EFII
KMYF, San Diego, Ca.
KEOS, Neosho, MO
Crew Chief
Grove Aero Super Legacy Reno Racer,
twin turbo, IO-540,
full EFII management system!
Race Coordinator STOL Drag coming to Reno, 2019
"so I got that going for me... which is nice."
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