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I've never dealt with them, but you could contact Stevens International, the company who distributes their kits here. They should be able to help you out. Contact info should be on the box or instructions.

I've gotten replacement parts for Trumpeter models in the past.  Stevens International is indeed the place to contact.  In my experience, they required the kit number and the part number.  They charged me $5.00 for

postage and handling and sent the entire sprue that contained the needed replacement part.  Their service was very quick, too.  It's been several years but, you might try this email addy:  

                                                        lauracarney@stevenshobby.com