You can buy them from any parts store with the rubber and mounts altogether. It's a pain to replace the rubber inserts. I've done it, and while you are suppose to just swage the tangs over mine were still loose. I had to spot weld them tight.
They are $6.23 brand new at Rock Auto for the Anchor brand. Or $11.68 if they run out of the 6 they have remaining in stock.
