Piper L4

I bought the Piper L4
http://www.hobbyking.com/hobbyking/store/%5F%5F52794%5F%5FPiper%5FL%5F4%5FGrasshopper%5F2350mm%5FARF%5FEU%5FWarehouse%5F.html
and after receiving I found out that the windows parts are missing. Meanwhile i have had a long discussion with your colleagues but the problem is not solved. I got as answer i should wait till supplier has send the spare parts but how long will this take? I am not willing to send back the plane because I have modified them and have spend round about 100 h.
Is there a possibility that you use the parts from an available kit and send them to my attention? Because the season goes to end and I want to fly this palne.

Kind regards

Mathias