Hi Herman,
I have Parker 31 No 21. I have the original brochure, which I could scan for you. I also have the original handbook which came with the boat and gives dimensions of all the rigging etc. Not sure about the bulbs. The handbook is on the boat so I can't get it till next weekend. If you would like me to send a scan of the brochre then maybe you could send me a mail (morganpd AT anglianet.co.uk).
Pat Morgan
Pat Morgan