Engine & Trans identification : RPO code location ?

Hi

I own a '01 T&C 3.3 in France VIN 1C8GYB1R51U102208 (made in Austria).
Special Austrian T&C VIN decoder : http://forum.chryslerminivan.net/showthread.php/17023-Chrysler-Voyager-made-in-Austria-invalid-VIN-number

1/ RPO code
I'm looking for the RPO code sticker / tag location (AKA option code list). Do you know where is it (fender ??? glove box ???) ?

2/ Spark plug
The engine VIN number is R = 3.3L V6 Cyl. OHV Gasoline (8th digit) but i'm unable to identify the correct spark plug part. Rockauto gives theses 2001 long thread SP : http://www.rockauto.com/catalog/x,ca...,parttype,7212
But i discover my minivan SP was these 2000 short thread SP http://www.rockauto.com/catalog/x,ca...,parttype,7212.

Any advice is welcome

Bst Rgds.