If you own a 1987 Buick Grand National, or other year Regal Grand National, or any 1983-1987 turbo buick regal (turbo T, t-type, Limited, etc.) for that matter, and you prefer to work on your own G-body vehicle, a body service manual from Fisher Body is a must.
The original factory GM version is better than any others that were produced, as they are generally hundreds of pages long with more detailed descriptions containing schematics &/or blueprints stating exactly where to find specific items pertaining to the Regal.
Most books typically cover BOC made cars (Buick – Oldsmobile – Cadillac) & B-C-D-E-G-K-J body styles (where applicable per manufacturing year).
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