MK4 Astra SRi

I 98% sure it has the F23 gearbox, and recently the gear change has become 'unsure' and sloppy, and sometimes jumps out of gear

Im due to fit a new black diamond sports clutch before PV and thought I would replace any servicable parts whilst the box is out.

What would be the common things to replace? Gear Linkages, release bearing, bushes etc?

Any help and/or EPC part numbers would be appreciated.