Mounts purchased from Aqua Drive are also Cushyfloat.
The amount of movement can be selected by choosing a durometer (rubber hardness) of mount that will limit deflection to whatever you want. See attached deflection chart page 2. Be sure and include the weight of your gear in calculations, divide by 4.
The easiest is direct replacement. Too often other mounts are to too tall, the footprint won't fit the available space, or as noted the mount itself interferes with the brackets.
A nice feature of Cushyfloats is they can be purchased unassembled. This means if they will fit your application you can jack the engine up just enough to get a sawsall blade on the existing stud and just cut it off. Slide the old mount out and slide the new one in and thread in the new stud from above with some locktite on it. If your replacement mount stud is not removable you may have to jack the engine high enough to slip in the replacement. This probably means disconnecting things like exhaust, shaft, maybe plumbing and wire.
Another consideration as mentioned is a packing gland on a hose and/or a coupling. There are formula's using shaft diameter / alloy for figuring allowable deflection depending on the distance from the gear flange to the first bearing or fixed packing gland. The longer the shaft, the more flexible the mounts can be.
The Cushyfloat line is a very good mount and a great value, they are very reasonably priced.
And for you Eurobanker, Trelleborg (Cushyfloats) is a UK Company.
Cushyfloat and Metalastic same thing. I think you look up metalastic on the web, there is a catalog there.
Cushyfloat Product Range - Trelleborg IAVS