Steering Bush Help

Hi, need some help identifying the correct rubber seal before i fit my steering guard.

Have just fitted a new steering damper and noticed I have a split in the rubber boot on the left hand sie of the steering. I think this is the Steering box ball joint but i'm not 100% sure.

The joint in question is the left hand side, on the right of the joint is the steering damper.
I have a photos, (quality not great), can anyone help

Btw, thia is a J Reg 200TDI Landrover Defender 90



Cheers

the seal is part of a kit to replace the drop arm ball joint