The only time i've broken that mount was when I jacked up the transmission without removing the bolts. I wouldn't think they would normally break unless something is out of place or you're other mounts are toast. Mine is a diesel, maybe others are different.
Anyway, I hardly ever buy old vw parts from autozone, etc. unless I'm worried about needing a warranty (which isn't often). There are lots of places; find the correct part number and you can search more sites.
175399151B ?