Tires: Finding the right tire to match, load index, audi a 4

Question
I have a '98 Audi A-4 and recently got a flat on one of the tires beyond repair.  The gentleman at the tire store said that because the vehicle is all wheel drive that all of the tires need to be exactly the same. He looked up my current tire and saw that it was not in stock, and had actually been replaced by a newer model.  So he recommended that I purchase four new tires, well of course he did.  After leaving I looked up the tire on the internet to see if I could find the old version, and I think that I have, but I wanted to make sure it is the right size- so that is my question- My other three tires are Bridgestone Turanza LS-H P205/60 R16 91H M+S, the one on the internet is the same except 205/60 R16 91H BSW, RBT will it work?

Answer
Jared,

 The Bridgestone Turanza LSH has indeed been dis-continued, why I'll never understand this was a good product.  The replacement tire is the Bridgestone EL400.  The tire that refered to is the same load index & speed rating as your present tire (91H) and I know from experience that the EL400 is also M+S rated(mud & snow).

 The amount of wear that your remaining 3 tires have is the main concern.  If the tires are over half worn I would replace all four due to differing diameters.  If the tires are only slightly worn then I don't believe replacing one tire would be an issue however, I would consult your manual or Audi to be sure.

 BTW, the BSW & RBT mean that the tire black sidewall and that it has a fancy finish.