ive just fitted the engine bolt mounted kit. The engine bolt is replaced and a cast metal unit then bolts onto that and around a portion of the trellis frame.
The crash bung then bolts throught the fairing into that metal unit.
Always used them, and they have saved me a fortune in the past.
only gripe is the metal insert which sits in the engine bolt insert was 10mm too long, and i had to whip it off with a grinder to get it to fit!
not good when you pay £150 for it!