DanMi

the 1152 is the number of turns of the cable per mile. That needs to be the same to get the correct calibration, not sure about the 42a bit

If the 2 halves of the bearing are drilled and pinned (mine comes from a mk4 spit) then it can be drilled out but then just use thread lock on reassembly. I had to talk to ODspares to get mine apart as I hadn't spotted the tiny pin so spent hours trying to unscrew it, they told me to just use threadlock on reassembly. Hopefully Pete is correct in your case

Once the bearing is out it is quite tricky to take apart as they are screwed on then pinned which means the pin has to be drilled out before unscrewing. You can buy the whole assembly which is much easier http://www.overdrive-repairs.co.uk/buy-spares.php?cat=D but out of stock or try odspares.com or you can get just the seal 506066s and oring 506115 from Jamespaddock etc cheaper but much more work (I have assumed d type od) I was advised to use threadlock when reassembling mine and has been ok for a couple of years now. ( I did it the cheap way but wished I'd just spent the extra)

When my mk2 was rebuilt (5 years ago) we used a new mk3 bonnet letting in mk2 sidelight repairs and a front grille panel (not a cheap exercise)