where to buy gearbox mount?

Hi Guys,

hoping somebody can point me in the right direction. I need to find a gearbox mount to mount a 240z/240k 5 speed gearbox into my 73 Datsun 240K. I have the crossmember, just need the bit (presumably rubber) between the crossmember and the gearbox.

Are the mounts common to the 240z? if so, any ideas where i can pick up one? are they common with any other cars? (200B, 180B, R30 etc.)

any help would be appreciated