Because most retailers sell the same stuff from the same source, your best bet is to find a retailer who will stand behind what they sell you. That way if you do get a faulty/wrong part, you have a better chance of getting the problem resolved. The problem is; most retailers don't carry everything you need so you will have to deal with the occational disappointing transaction.
In my opinion there is nothing more disappointing than receiving nice new replacement parts for my vintage American truck and seeing that 'Made in China' sticker proudly displayed on EVERYTHING! As Cletis says "buy NOS or used when you can".
