Old battery tender
Piece of 50x50mm aluminum shaped and bolted to the battery support bracket.
NOTE foam under connector to stop rubbing against frame.
New Ctek battery tender on same bracket (I always write on relays and fuses what there for, helps in the dark, I also adjust the fuse supply that I carry as well)
It doesn't rub on your leg
I have some of the measurements if anyone is interested in making the same.