The alumide material is "just" WSF, enriched with alumide powder.
Technically, it could be used for bushings - but for THIS purpose, I won't trust in it.
Do you need a flat surface on the outer side ?
Otherwise, a "checker pattern" layout (like seen on
stainless steel under 3mm) could be used.
The car's weight is static stress. Calculating static is simple - because nothing moves.
But calculating
dynamic stress is really un-funny.
Is there some kind of metal-working craft business in your area ?
Almost everyone with a lathe should be able to make these bushings.
This way, probably
- they would be sturdier (because the material is really solid)
- the surfaces would be smoother
- there's a good chance to get them less expensive