Right hand drive Boxster Japanese import help

[Daggerlee]

I have a 2000 Boxster Japanese import which has the driver on the right hand side. My driver side (right) seatbelt has seized up and can no longer be used. I cannot drive the car without a seatbelt. I went to a local Porsche mechanic and he told me that I need to find one myself then he will install it. He does not want to be out any money if he gets the wrong one since it is a Japanese import. Does anyone have any information on who I can speak with or buy one so he can install it? Would the Japanese plugs be different than any other Boxster's? He is worried that the plugs that trigger the airbags would not be compatible. If anyone could please help me find what I need that would be grateful! It getting warm out and it would be a shame if I could not drive my car this summer because of a seatbelt. Thank you all!