Lwin
I am assuming the euro parts are different, otherwise you would not be bothered wanting to change.
I do not know myself what differences there might be, except that US cars were assembled in the States, and so would have certain Federal regs applying only to these cars.
Eddycat would agree that Subaru do not normally apply change for it's own sake, so the parts you list will probably fit OK.
Suggest you contact Phil Skuse {Phil/Belha from the UK Yahoo site}
Phil has a Japanese spec car like mine{different again to Euro spec}, but also has the US workshop manual, and would be familiar with the differences from the manual, as he deals with UK dealers.
Also, if you do a Google search for Bell & Colville, they are a major UK multi car fanchise, who specialise in Lotus, but also support Subaru, incl SVX. I would bet they can price your parts, if Phil can verify fitment is not a problem.
Best of luck
Joe