This is where all the ABF conversion junkies hang out, so I hope nobody minds me posting in this section

Got an ABF from an M-reg mk3, to be going into a 1990 G-reg Mk1 Caddy

Have been stripping down my ABF loom, great fun

But 99% of it makes sense now and is all labelled up... (Thanks to
www.dannyp.info, cheers!

)

I returned to the mk3 that I ripped the engine out of to grab the transponder box etc. (Before he didn't want me to take the key as he will have to steer it out of the barn, but today we came up with the
obvious genius idea of snapping the key off in the lock.)
Here is a pic of the box and key:

The round space in the middle of the key... do I need the cell-looking round metal thing that should be in there? Or does the inductive loop pick up off the grey rectangular part? If I need the round bit, will a VW dealer supply and code it for me for a less-than-extortionate price?
The data-link from pin 43 of the ECU is Grey+White on mine, I assume I need to join this to the Grey+White colour on the transponder box... but what are the grey and black wires for?
Thanks in advance,
Calum
PS: DannyP, I have written down all the wire colours that were different on my loom compared to your tables (not many, just a few), would you like me to send you them?