Not necessarily. I've seen a hatch with an H22A swap using the HASport mounts, as well as ridden in it, and allthough it's only a claim, the owner told me that he hasn't broken any axles in the 6months that he had the swap. So take the info for what you want. Allthough I do agree that custom mounts would be ideal, but the only thing with that is that for the axles to sit straight, the motor will be really low into the engine bay, therefore providing less clearance for the oil pan above the road. So custom mounts would only be recommended for strictly a track car, IMO.
Manny
CX powerd delSol