No spare starter motors at the moment in fact I bought spare 500 & a 126 cable pull types on eBay as back up spares . Also you can buy new all of the parts you need to overhaul a knackered one so with a little forward planning they are no problem.
I am not sure , until I get them off , what the condition of the rear suspension arms & I assume you are referring to the brake backing plates are but you can get a brand new pair of each for about 100 euros + carriage which I guess would be better than getting a rusty old set and paying to have them blasted & powder coated.
Some ones' got a thing for bling then

when you say chrome door handles are you talking about the outer ones that have the stainless centre handle ?
Side window trim is alluminium unless you are talking about quarterlights on some cars and do you mean engine cover lock ?
Looking for wiper parts , may have some stainless ones [-/