Smaller rim

[Sethg243]

Hello.. kind of a newbie here.  Anyways,  I’ve got a 95 Lexus sc300 with 47k miles.  I saw some rims from an 01 Lexus ES 300 that at 16x6 inch rims.  The manual calls for 16x6.5 inch rims.  Can I downsize on the width by a half inch? What size tire should I get?  I know it’s a really basic question but I really just dont want to buy rims that don’t fit.  I just bought some off eBay that didn’t fit 😂

thanks all