I have no experience taking cars across the border, but the time spent to locate and transport an unrusted 240 from the south or out west would be much less than the time you will invest in rust repairs. Until you strip out the carpet and remove the undercoating you really won't know the full extent of the rust damage - It's probably much worse than you think.

I'd get an unrusted example and use my runner as a donor myself - Good luck!

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You can't always get what you want, but if you try sometime you just might find you get what you need.