I can tell you what the power window add-on for the coupe consists of as my build is a S to C retrofit:
  • new door bars
  • window glass
  • window regulator
  • mount brackets & fittings
  • guide wheels
  • weatherstriping


The door bars have a very different shape than the straight bars provided in the S kit, but the front and rear mounting points are exactly the same, so you should be able to use the same mounting holes in your door skin (if you're already measured and drilled them).

Installing the window regulator is a simple bolt-on affair. The provided brackets are slotted to allow some range of adjustment of the window track. In my installation I actually had to reverse the bracket alignments from what was indicated in the instruction manual to get the (nearly) correct angle of the window to it would align to the coupe body lines.


-showing the door bar with the window regulator & track installed. The guide wheels are small and white held on the top door bar and press the window "out"/guide it when rolling up/down.

The windows are installed with no further supports than the window regulator & track + 2 guide wheels to press "out" from the inside. There is no outer frame provided, and as such without the coupe top the windows will be pretty unsteady in your open top installation. A soft top isn't going to help with any structural support, so I'd be pretty worried about the glass windows never keeping a good alignment/fitment in the first place and then doing a poor job sealing against the soft top.


-the window in a partially up position. It presses against the felt gasket on the edge of the opening to form a seal. There is no real support for the window except this pressing "in", which wouldn't be available without the coupe top.

If, maybe, there were usable "A" and "B" pillars you could make tracks to guide the window and hold it in place, but that would require a huge amount of work, since the windshield frame would have to be heavily modified for your "A" and there really isn't anything there for the "B" pillar.

Hope this information helps, and sorry to be a nay-sayer. Let me know if you need any more info!