Rock auto shows them as available. I have seen errors in catalogs for these mounts. You need 2303 and 2304. The first couple of letters or numbers in the part number is for the manufacturer designation.
Interesting...I'll have to check that again. I just looked a couple weeks ago and the right side was out of stock. I put in for an email notification when they were back in stock and have not received anything.
NAPA is out of stock on the right side. Same as Rockauto said. These things must all come from the same source.
Classic Industries says they are in stock for $16.99 each.