One-Piece Window setup

[56SS]

Ran into another issue with my project.

The previous owner had bought the 1 piece window kit to delete the vent windows in my 56 pickup. He never ended up securing the windows permanent, they were only sitting in the track. Well, I found out why. The way the windows are shaped, they need to float along the track in order to roll up and down properly.

Anyone out there switched to these windows, and how did you get over this hump?

Thinking of buying a power window with with fluid rollers to eliminate the problem, but not sure if I want to spend the extra 400 bucks to do so.