From the YJ parts lists there are three part numbers for fuel tanks...
TANK, Fuel
5201 8286 1 15 Gal.
5201 8287 1 20 Gal.
5202 0522 1 20 Gal., Egypt
I'd presume the Egypt part is different in some way as the vehicles would have been for military use. Other Jeeps of that era don't have any different part numbers listed for LH/RH Jeeps so I'd guess it would fit just fine. You could always ask the dealer what the part number is if you don't already have it.