One of the big questions asked is how to decode - body tags , VIN tags, protect o plates, engine and trans codes. the Boattails Registry has a guide for this and although written for boattails it applies to most other 71-73 Buicks. as well the the ALL Buick library has parts books and fisher body manuals chassis manuals with charts for the trim codes and colours codes, engine/ trans rear axle codes etc. for other other year model BUICKs (more early 60's coming soon including intermediate specifc) see whats in the ALL BUICKS libraries at http://buick-libraries.boattail-riviera-by-buick.com/ From the public area of the boattail specific library, This will give you the basics of how decode the tags (71-73) Documentation Decoding & Vehicle Matching Guide <center>new boattail registry members get a searchable PDF of this and a more detailed version is in the works </center> From the public area of the boattail specific library - For boattails all the trim and colour codes are here along with production numbers by colour and options Boattail Riviera Option-Production Numbers - Prices - Availability-Colors new registry members get a searchable PDF of this and we have a poor quality option production for all other 71-73 models, but there hasn't enough library particpation from other than boattail owners to bother extracting and building into a book just for them. - I know there are board memebrs out there that this info l and more for all years but they haven't shared it yet. 65 to 76 FULL SIZE BUICK only colour and trim codes can be easily found in here - includes how to decode earlier and Canadian body tags etc. <center> </center> 1965-76 FS BUICK ID and Trim Info GM Canada - sent in by Dana Laiche Alll BUICK 64-72 colour and trim codes are in here and the individual year fisher body and chassis manual - many of which are in the libraries (more for the early 60's coming soon - they also show how to decode the earlier body tags. ID and trim starts on page 48, 72 interior trim chart is on 78 - and shows 100 as green vinyl bench available on a number of lower series models. page 86 has the 72 colour combination chart - include the sales/fisher codes and OEM paint manufacturer codes as well as touch up part numbers. <center> </center> 1963-72 Master Parts Book -- Body Section -- -- May 72 reprint -- 1972 GM Corp The libraries are "contributors only" to get access see http://buick-libraries.boattail-riviera-by-buick.com/