good tires for stock 15's??

I've got the stock turbine style 15's on my 90 GT. I really like the look of the stock wheels, but I'm having trouble finding good tires to put on them. I want to put tires just a little wider than stock (like 235's), but cant find any and dont know what size to look for.
Also, I'd like to get 4 lug spacers to get a wider stance. but can only find five luggers.

Any suggestions appreciated!