The 1994 Wrangler DOES come stock with a spare tire mounted on the back.
The wheel should fit, the tire depends on the wheel.
The correct tire size for a 2014 Jeep Wrangler is P225/75R16.
The correct factory tire size for a 1998 Jeep Wrangler is P215/75R15.
The correct factory tire size for a 1992 Jeep Wrangler is 215/75R15.
The correct factory tire size for a 1993 Jeep Wrangler is 215/75R15.
The correct factory tire size for a 1997 Jeep Wrangler is P205/75R15.
The correct factory tire size for a 2007 Jeep Wrangler is P255/75R17.
The correct factory tire size for a 1987 Jeep Wrangler is 215/75R15.
The correct factory tire size for a 2014 Jeep Wrangler is 255/75R17.
The correct factory tire size for a 1994 Jeep Wrangler is 215/75R15.
The correct factory tire size for a 1010 Jeep Wrangler is 255-70/R17.