Tires

Hey, I was woundering if someone could tell my what size tires I kneed to replace the stock tires that are on there right now. I have a 1998 blazer. I would go check tire size my self but I lent the truck out for a couple days. If someone could get me the size that would be great. I just want to start looking for tires and the best deal. I will confirm tire size before I purchase though!

stock size is 235/70/15 i believe.

Or could be the optional size of 235X75X15