What size wheels and tires will fit on the 1991 Acura Legend?

I have a 91 legend 4d which is lowered about a 1.5" front and back. I put 18 in wheels on it and it fits fine. When i got the rims the guy said 20's would fit but i would have to raise it up so i just went with 18's. My tires are 220/18/40 i believe, may be 240 i can't really remember and my car is at home at the moment. but be carefull what offset you get because if you get the wrong offset then your wheels will stick out from the fender and the back fenders tend to rub when you have weight in the back seet or hit a bump.