On my 1992 sc300 i have the regular radio in it and i want to buy this new one but i was jus wondering i didnt no if maybe it wouldnt fit or something if its only for certain cars can i easily have this installed in for the old one?

http://www.xtrons.com/doce/productdetail.aspx?pid=31

 

Looks like any aftermarket head unit; looks like you'll need to a din to fill in the gap that it will leave.

 

If it is a single din like the ones pictured on the site, it will fit. You would just need to buy an adapter like this one.

 

which one wud i get the first single din one right?

 

Yes, you would get the first one if it's a single DIN and the second if it's a double DIN.