Hi Chops,
I can't reply to your previous post either - I had a look on the protech page and you can select different top and bottom bush sizes, both width and hole diameter in either bonded bush or bearing. The widths jump from 32mm to 35mm though so your 34mm may need 32mm with a washer or two. Doesn't seem to be any issue ordering with 12mm top and 10mm bottom though. You'd also need to know the fully open and closed lengths and spring internal diameter. They are helpful on the phone.