Originally Posted by Lilnuts2
Sell the top you have and get the one you want.
Agreed, you're talking about major fab and reconstruction here including the hard part of adding a taller top, which is removing old one and reinstalling whatever goes on. Adding the spacer would actually even be harder than that.
I wouldn't want to drive down the highway with a fiberglass Whopper on top of my van.
Also, whoever can make a spacer can probably just make a top.