So many engine mounts - which ones to buy?

The best advice I could give is to consult a dealership for the exact match for your car. However, your local parts store is also able to do the same catalog look up for you. These days It is very attractive to go online to search and acquire just about anything, and for good reason - convenience, autonomy, efficiency, price...time saving...and so on. However, nothing ever replaces a well developed relationship with a local automotive professional that can really be of assistance. My advice would be to try your local dealer, try a parts store...then compare the pricing and information and go from there. Good luck.

with 300000 miles i'd be tempted to replace them all.