I just called advance auto parts and they said there were 2 versions of the belt for my car.
Not just the brand but 2 designs?
1st design $25.99 (895k6)
2nd $25.99 (763)
Which one fits my 95 lexus SC400?

 

the part your "pulley" on the floor isn't called a pulley its a harmonic balancer the reason it goes bad is from wear and tear and it goes bad eventually only fix is to replace it replace it with a oem one not a lightweight one there has been many a thread about this... the only reason they may say two versions is one for the sc300 and one for the sc400 is anything since i'm not familiar with the part numbers like i used to just take your old belt in and match it up. If you didn't fix the harmonic balancer then its pointless of trying to find the noise as it may be moving and causing the noise you hear.