The wand cap may be tricky, as it's bespoke to the machine, same with the switch cap.
I should be getting an 04 zorbster this year (must remind the bloke when I have some spare money to pay postage), to make one lovely one out of my shit one and his OK one. May not help you immediately though.
The zorb dispenser is very VERY common on ebay, often unused. Hell, I had one of my customers drop a brand new one off to me with 2 unused tubs of zorb a few months ago as she was going to bin it (owns a 25 now, I'd just relieved her of £65 to refurbish it!)
Failing that, if you just want to sell it, put boggo yellow eand cap and switch button on, any old switch housing and cable and sell it as a DC04, I guarantee you 99% of punters looking for a £50 DC04 won't even notice it's a zorbster, or even know what one of those is! I only want mine working so I can zorb, having never done it before! Must get the new motor fitted I bought. One day etc!