Since others have been slow to respond, let me take a short stab at it--and hopefully, those people who really know what they are talkikng about will chime in and correct me.
First, it appears that you are looking for an older Class A rig (the 35-40 ft requirement).
As far as I can recall, the older Class A rigs that were only 8ft (96 inches) wide--and referred to as Narrow Bodies)-- were primarily made before 1998. Almost all of the Class A rigs that I can think of built after 1998 were 8 ft 6 inches wide (102 inches) and are sometimes referred to as Wide Bodies.
Not sure where your 98 inch requirements comes from. It is possible that some of the older bus-style motorhome were only 8 feet wide, but I am really only guessing here.
If you are going to keep the rig in the US, and sell it later, then you are limiting yourself too much trying to stay with a Narrow Body. Even though there are a few states that supposedly limit an RV width to only 96", no one has been bothered nor stopped in these states.
In looking for a used motorhome, I would suggest that you look at models newer than 1998, since many good changes in chassis and features occurred after that date. With the economy in the US not being in very good shape right now, there are LOTS of motorhome owners anxious to sell their motorhome, so you should be able to find a good selection at reasonable prices.
OK, RVA guys, jump in and help Barb--and correct any of my statements that are off base.