RE: order yhst-17210252890263-156690
In your shoes I'd merely pry up the canopy sides, using a nail file or something very thin to break the glue bond along the sides first...
Glue the seat back in, then reglue the canopy... an easy fix.
Elmer's white glue will work fine for this.
It's much easier and far quicker than trying to get a replacement.
FYI: Nitro's staff does not frequent these forums as often as they used to.