Allmost sounds like my the Opel Manta I used to have.
Had 15mm socket on 12" of 1/4 drive extensions, 18" of 3/8
extentions, and 6" of 1/2" drive extensions with 1/2" breaker bar. All this generated about 3" of curve, but it
worked. I have found out from working on German vehicles
that a "S" shaped box end works wonders. Snap-On has them
expensive about 25-30 dollars each. Comes in two different
box sizes on every wrench.