The manual that came with the spoiler was printed in '78, the spoiler itself is a few years newer for an '81 Mercedes, so I doubth they still make these.
I don't want to 'spoil' the topic too much with offtopic stuff but the propane-system in my car isn't anything special.
Here's an older topic where I listed some of the parts that are used in these systems;
https://board.moparts.org/ubbthreads/show...rt=all&vc=1One of the drawbacks of a propane system could be the heavy tank-weight which being put in the back of the car usually.
My car has 2 of these tanks for some added range but it sure changes the front/rear weightdistribution of the car.
