LUC's suggestion to just get the 998 parts from the dealer is very good. However here are some things that I learned when I did it last week:
1. For a 998 Recall, you need to have the dealer order TWO parts kits, the CAAM9981 AND CAAP9982! 9981 has the reinforcement plates for the steering mount, while 9982 has the reinforcing plates for the differential mount. So if you own a 1996-1999 Viper be sure to have them order BOTH kits.
2. When the dealer agrees to get the kits for you, he should prepare a work order as if his shop will do the recall. This is how he gets reimbursed for the parts. This work order will also most probably get him reimbursed for the labor as if he actually did the recall on your car. You will have to give him your VIN to process the order and recall.
3. This means that Chrysler now thinks your car has had the recall completed. If this is OK with you, go ahead and find a dealer who will work with you and get the pieces for your car. I have done this, as I do not "track" my car and do not want to risk having the work done in such a manner that my car ends up worse than if it had not been touched. However, I now have the correct pieces if ever needed or if a future owner should need them.
4. This means that I can no longer get the work done for free at a dealer, as my car has now had the recall "performed",
5. The dealer instructions for the recall extend to 96 pages and are extremely detailed. They are available on-line to dealers and they also have a hard copy in their shop. Be sure you get a copy of these to just keep with the parts.
6. If any enthuiast dealers read this and I have mistated any of the above, please feel free to correct me so other owners can have this oppertunity.