Pretty sure that QH, and ford both still do this bush, certainly ford did around 3 years ago, as I bought one then.
Personally I would use the std ford one, in this position the last thing you want is a harder bush, esp when it's not needed, a new unsoft one will make a big difference, did in mine cured 90% of the 50mpg/5th gear vibration, the box being totally shagged didn't help of course!!
tabetha