Patrick,
You could have it cut locally if you have good pieces for templates (
Jim Carter sells patterns - $10).
I got mine made by a vintage glass shop in Georgia (I cannot find his website - he may be out of business). By the way, 54/55 rear side-glass is the same as in 47-53.
When you say $100 per side, do you mean per pane, per pair, or for four side pieces?