I have just fitted a witter towing bracket to my Mk3, it was fairly straight forward once I had realised that the long metal strips with bolts welded in are meant to go inside the chassis box sectionwith the brackets. At first I assumed the bolt strips went on the outside to sandwich the chassis wall between the two. There would be no way of getting the nuts on had I persisted withthis error.
Cut in the bumper and new screws and penny washers to replace the un useable rusty studs and plastic nuts. The sheet metal 'nuts' used to hold the heat sheild are equally useless affter a few years rust, does anyone have a favoured replacement other than self tappers.

I found an electrical connector behind the rear bumper, is this for the trailer lights or is it for parking sensors? pic below.

I held off wiring in the socket with scotch locks in case this is a trailer light supply but I couldn't find any mention of it on the web.
More pics to come once I have kicked photo bucket a bit harder, ( I hate that program)
Regards
Ian