This Collins 30S-1 NEW Set of 3, Heavy Duty Amplifier Blower Mounts, is the exact replacement blower mount for the 30S-1.
It has the same weight per unit specification (2 Pounds each) but this version will not allow as much Axial or lateral movement which seem to tear the original mounts after they have aged.
This version was made be the same company that made the original mounts, and is an improved version made with very high quality rubber and an anodized bracket.
It is only a matter of time before the original mounts will fail as most rubber part do, so you may want to pick up a set to have on hand.
They are fairly easy to replace.