Hi RichardV6

I am afraid that's not a good idea.

Stainless steel and aluminium hate each others present.
Stainless eats the Aluminium fast.
Cause : Electrolyse. Especially at this point where you have very often water.

A former owner of my M3W used SS refits to connect the body to the frame.
All aluminium is damaged around the refits. You can see the paint 'bubbling'.

So always use the galvanised bobbins and not the SS ones. Zinc - Galvanise material - is nearer to aluminium in the periodic table.
Even Tefgel will not help here connecting surface is too big.