I have 245/40/18 on a 98cobra with eiback springs, I am wanting to go a little wider with the 2 rear wheels and wand to keep the 2 up front 245/40/18. My question is what size tire to go with that will match the other 2, I would like a 275 width but not sure on the profile, don't know if I need the 40 profile or 35 profile since it is a wider tire, also what type of tires are good street tires and hook ok but not a drag radial, Thanks