Yes there are clamp adapters and they are nice for presses that use a flat piece of tooling plate to clamp. We have a bucket full of them but this press does not have clearance, even after modifying the studs on the air clamps for adapters. On fact, even with the mods I made we can only use the manual clamps and that is without the mesh protectors we normally use.
The springs on the heads are also unable to lift the weight of an M3 and still bring in down to the buck eye leveler properly.