It's 4.5 inches wide at the back (same width as front of seat). Definitely not as narrow as a Majesty style tank, but pretty close to stock width (maybe slightly wider in knee area). For me, the Clark tank is the best option because I wear knee braces and tend to fall more than I'd like. It took me about 1 hour for the stock tank to look like Mike Tyson got mad at it. Fiberglass is not an option for me due to constant use and not wanting to drain fuel after every ride.
The center mount hole was a turn-off, but I use hole plugs to hide the ugly center mount bolt.
Kickstart lever is from a 1991 or 1992 YZ250. I had to drill through kickstart knuckle to install a set screw which was a major pain, but stocker was so floppy it was worth the hassle.