hey, first post here! i have a delta 88 1979 with pretty rotten doors. i'm wondering if i can look for the doors on any other gm car or olds model, as finding them for the 79 delta is nearly impossible here in the EU. its a 4-door

 

www.car-part.com. I'd start there. Larger yards/operations will have established shipping procedures in place. And likely have better deals, on shipping, than individuals can get. Then I'd try the larger speciality yards - DVAP, CTC auto ranch, and LL Classics. They too will have better deals on shipping, and established procedures for such.
The E side El Paso TX yard, did have an early Eighties Delta, clean western TX body, believe it's still in there, but the cost to move those pieces would be astronomical.
Wasn't there a Guy, in the Netherlands, parting American Cars? Think saw that on the Buick site. Also remember a video once of a similar operation in Sweden, as well.

 

I believe you will find 77-79 Oldsmobile 88s and 77-79 Buck LeSabre door shells to be the same. They are both in the B body family. The interior trim will be different in most cases. Also consider power or manual window set-up.