Right side toward fuel tank by spare tire.
5Banger is right, as to where to look for your electric air pump. Should be as he says under the spare tire panel on the right side toward the front. Let us know if you find it. If you have someone lock the door while you listen in the trunk it will be a dead giveaway.
"Tell me and I will listen, Teach me and I will learn, Show me and I will accomplish, Involve me and I will succeed."
'84 300SD 256,000 Gold on Brown (Mileage Award)
'86 300E 246,000 Blue on Tan