H7 and H9 are the ones listed in my handbook for a 2006 Mk3 and I know they’re correct as I’ve just replaced them. This isn’t to say they’re the same for the Mk 3.5. What does your handbook show them as ?
HB3 look very much the same as an HB9, Not sure but I think the difference is in the diameter of the bayonet fitting. Hopefully someone with a 3.5 will be along to help you soon.
The manual states HB3 and H7, Having looked on the headlight itself this is indeed correct so glad i didnt buy the set as per the 3 websites i used as all 3 were wrong. I can take a photo of the manual to help anyone who wants to see the full listing?