1970 C30 Longhorn advice

[Canadian C30]

Hi Guys

I'm new to the forum and live in Ontario Canada and just came across an old girl that I just had to have.

After a few days of play and some tinker I got it running and all seems well. With 53000km on the clock and all mostly original and a PTO I was thinking about restoration and finding a box.

I then measured the wheelbase and realized that this was 133"

Are boxes rare for a longhorn truck? or should I find clean one and graft in a section to make up the length. Hard to find boxes here in Ontario where it rusts all year long.

Any ideas? Know of any boxes that I could have a truck pick up and ship to Ontario?

thanks
Howard