Just got a new 1985 rx7 gsl need help
 

So my uncle sold me his 100% stock rx7 (only 59k miles) and i want to get a new steering wheel and wheels i want to know if i need a steering wheel adapter for a 6 bolt sparco wheel and i also wanted to know where i get it if its needed. Also i wanted to put konig 35a wheels on but i know literally nothing about wheel dimensions so i would like with that. Thanks.