I found the glow plugs from the parts list. I can't get the search function to find glow plugs.

Try - http://www.pelicanparts.com/cgi-bin/ksearch/pel_search.cgi?command=DWsearch&description=glow+plug&I1.x=0&I1.y=0 after selecting an '87 300D or enter "glow plug" in the search field.

Sixto
87 300D