Tbone, I copied down your # now-- will check if the bench is still available, and give you a call.
And to answer your question, I imported a bench bed from here:
https://fabworxuk.com/fullwidth-bedz/ . It was an extraordinary undertaking that I probably wouldn't repeat. The only benefit (after downsides of 4+ months, customs delays, having to modify the frame) is there is slightly less of a "crack" between the extension and the folding two panels of the bed. Those of you who've slept on one know what I'm talking about-- we previously fixed this with a mattress topper, but looked fwd to not storing / unfurling one of those each time.