Ahem....
The narrow bodied Plus 4 is a niche market.
It hasn't appeared on the price list while I've been looking, and I couldn't fathom where it fitted price wise, although it will be closer to Plus4 than 4/4.
My 4/4 Anniversary is a Plus4 in the log book, and I've insured mine as a Plus 4.
All very confusing. Pick up is planned for Saturday.