Central Locking

I am thinking this is the right place.. Body work etc.. for a Central locking post.
Some may remember my puncture repair to the boot lock central locking assy - where the actuator rod comes out the air driven part, there is a little rubber trumpet.
Finally gone again, and not sure I can seal it up so always get the CL pump overrunning as there is no back pressure, until it gives up.
Any idea if I Can get that part? Would you guys have it? anyone got experience?
Its this part arrowed..