Hi Phil,
I had to make a set for my new Tiger which never had any. I had wondered why the front mount only has one ear sticking down from the inner side. I found out that side is stronger because it is welded to an actual box section. The other side is just welded to an unsupported connecting piece of framing. This could easily be re-in forced with a connecting piece to the floor pan.
The only thing I modified on my setup was the addition of a safety loop using the front spring mounting bolts. Until I am confident that my welds will hold, the loop will catch the bar before catapulting my rear-end…
Cheers, Gilles