Needed a pair of these for my 912 , nobody does them in the original style rubber . You can get Solid mounts or hard rubber mounts .
These are used on the 901 and 902 Gearboxes . (This mount is usually used on the early models 1965/66/67)
These can be pressed into the cradle with a little silicone lube and i used a small press , you fit the rubber first then the steel insert is pressed in after to lock the rubber in place .
The steel insert has a slight radius on one end to help the insert to press in through the rubber . They look and fit /feel the same as the originals .
Selling these as singles or as a pair up to you what you need , i recommend changing both at the same time .