I once had a Datsun B210...it was a small "fastback" model, powered by a 4 cylinder engine. It was hard to fit 4 into one...almost like torture to try to fit 5 into one.
...not sure if I've ever heard of a B10, though...doesn't mean there wasn't one, just that I've never heard of one... 
 
Datsun had some strange model names for their small pickups, I do recall that.
Cheers!
Dugly 
