Purchased 99SL and spare didn't look right so jacked up car and lo and behold it didn't fit car...sooo I need to get a rim and tire for it. It is a sport with 18" so questions

#1. What was the original tire spare combo for 99 SL Sport? 17" 18" and tire size.

#2. Will a rim from early R129 fit a 99. are all R129 rims interchangable? Thinking of getting a new cheap rim for $120.00 from tire rack.

Thanks

Callen