Here's a pic of my mounts, through bolted to the stringers. Simple and functional.

All i see on that picture ,,,,is u need longer indicator cables on the tabs. LOL

Here's my mounts with the 'U-Shaped' Clamps that then get bolted through the stringers over where the old mounts used to go. ( epoxy and doweled the old holes first)

I then welded the box section replacement mount bases to these plates: