Top Ball joint - just Checking

[paulspray]

Hello,
on my GTO (2.5)
I've diagnosed the rear left upper (swinging arm) ball joint as knackered !

in the FAO section is says.....
"top ball joints front and rear GT03 32mm dia hole in alloy block"

Then there's a picture of a ball joint in a box with TC301 written on it.
Is it a case of just google search "TC301" ?

They appear to be used on metros ! ! ( LH thread )

Ps. I guess it's a fairly simple job
1 wheel off
2 nut off
3 ball joint splitter
4 big spanner
5 revese the above (with the new part)

Thanks for any help