There is no such thing. Try and find the GM Chevy Monte Carlo Manual preferably with 2 smaller manuals (one electric) for 1987. Haynes is better than nothing. Also, buy the shop and parts manuals for Studebaker Avanti from one of our excellent vendors. The car is GM. The body is Avanti. Back in the day I was lucky enough to find information specific to the '88 regarding how to remove the dashboard which is different from original Avantis (reach the heater core). This information was included in my sale of the car so I don't have it now - but someone might (It was typed and not published).