I cant remember if it was 10 or 11 that had the side airbags but if that is the case your best bet might be find an upholstery shop and get a quote. There are also a couple sellers on ebay that sell OEM quality leather covers. This requires to remove the current fabric and replace with the leather.
Other options, if you are really handy you can make alot of seats fit but you will have to modify the seat brackets. Also with have to watch the width of the seat. Rangers are pretty narrow.
And if you dont have the side airbags a set of 95-01 explorer seats could work.
2007 Ford Ranger XLT - 4x4 4.0L w/5 speed manual - Double Lifted on Fox Coilovers
1998 Ford Ranger XL - Daily Beater 2.5L Auto - Lowered 4/6 with c-notch