Well, we'll see. So far I got everything I wanted, many times even for free. Revell told me that replacement parts are salvaged from damaged kits so the time needed to prepare and send a replacement varies. If it takes too long to find a replacement or if there is none available Revell will tell you that. Recently I successfully received three A-Wing pilots and two sound modules from their SW kits without hazzle. Even though Bandai delivers top-notch quality there is always the possibility that a kit gets damaged during transit or re-packaging, so there might be some extra parts available.
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Sent : Unfortunately I don't know where you live and if the procedure is the same world-wide, so I can only describe the procedure in Germany. You write an email to Revell
service@revell.de , state the kit number, kit designation and the number of the part(s) you need. Tell them your address, too (this speeds up the process tremendously). Usually you don't get an answer and find the part(s) in your mail a few weeks later. If you have to pay a fee because your order exceeds a certain limit (I had to pay a bit for the electronics) they'll contact you. If you think the price is too high (which is unlikely) you may cancel the order. If you pay the fee the parcel will be sent to you as soon as the money is received. Just give it a try, the ISD is still in their catalogue.
If Revell is re-issuing the vehicle models I'll try getting the parts for several standard TIEs from them (I need six of them in total and have no need for 6 Vader TIEs that would come with them). I'll definitely have to pay for them but a query will tell if it is cheaper to order the parts as extras or to get the full kits (and sell off the unneeded parts).