Sorry for late reply but I haven't been on the site for ages!!
I have just looked at my instructions and the Part 3 is missing from my instructions also....but I never noticed!!
I have had the top down once this year and took 'Mrs P.' out and she was very pleased that her hair didn't blow around. I still maintain that if you own a Cabby then this itwem will help enhance your driving pleasure!!
To give you some idea, the additional wind break that I had in September last year was sold within 5 minutes of my arrival at the Mk1 Gaydon meet. People were gathering around the car asking about it and 2 couples were after it in the end!! they got a bargin for £80.00
Dano