I am assuming the tires are original.AT 13k take a good look at the rears.Is there much left???The fronts,if original,I would replace the pair.If it were me I would buy a complete set(all four) Then you will know what you have with no surprises(plugs/patches)With tires generally you get what you pay for.It dont hurt to shop around.There are tons of tire critics rite here on the forum to help guide you to tires your looking for.This time of yr with the wintry weather,its a good time to buy and accumulate what you will need for spring to "gitter ready for fun time drivin" Good Luck------------------------Dave