Went to the Original Mattress Factory to get a new mattress for the Vibe 6501.
The OEM mattress is a Short Queen measuring 60"X 75" so I figured that I would have to settle for Full size that measured 54"X 75". Plenty big enough for me & my DW and would leave 6" to one side for storing quilts and stuff. Problem is, the opening to the bed area is 51" at best and would require flexing the new mattress and that could bend the Frame Wire and distort it.
After talking to the Sales Lady, I found out that the Original Mattress Factory makes their own and could (within reason) make a custom mattress for an additional $50.
The option that we chose was 60"X 73.5"X 10" with a pillow top. Not only that, they will make it so it hinges in the middle (37.25"X60") so I will be able to install it.
I'll pick it up this weekend. Needless to say, I'm a happy camper.
If you're looking to replace a TT size mattress, Check them out.
TT = 2013 Vibe 6501
TV = 2015 Nissan Frontier.