You sure about that? It's a 93 with a metal tank? Metal tanks only came on 87-90...
EDIT: I think you're looking at the skid plate. I'm looking back at pics of your Jeep and you have the factory looking 1993 skid which doesn't work with metal tanks. Pretty certain you have the plastic tank with a metal skid. Which means you have a 20 gallon tank, limited to 15 gallons. This was pretty standard in 1993. Take a closer look and confirm if it's plastic. You very likely don't have any reason to buy a new tank, you just need to do the 5 gallon mod to your tank, and get a new sending unit for accuracy.
PS: Don't bother with Genright. They are WAY too expensive and they are not bolt on in a YJ. Two of them are not bolt in and require frame, exhaust, and body work to mount. The other one is bolt in but requires chopping and welding the sending unit to fit the different tank height. That right there is likely going to make accuracy incorrect also. Stick to the tank you have as long as you can confirm it's plastic which I'm pretty certain you can. Just take a closer look.