yeah those seatbelts are essential, I don't know how I would get the figures to fit in without them. I think those seatbelts are universal though , I have seen them come with other vehicles like the thunderclap, 88 pulverizer, and others.
It is much bigger than the BUGG. It is the same concept of a vehicle - a wheeled underwater attack vehicle that is a platform for subs, a missile launcher and jet ski type vehicles. Plus the driver is pretty cool - Decimator http://www.yojoe.com/action/90/decimator.shtml
I really like it a lot and was quite suprised on how big it is.
1990 year vehicles are a little harder to come by and this can cost you $50-75 complete. There are a lot of parts to it.
I have an extra and have been playing with selling it for the last year but I like them so much I will likely keep it so I can have two.