To answer the first question, no one knows - it's not required info when you sign up for the forum.
As to the poll, first decide what you want to know - the year? the model? The more questions, the more complicated the poll.
If they have a 67 and a 69, then if you ask what models in the same poll, you wouldn't know which model went with which year. Only other way to handle it is a poll by year and that would be kinda messy, IMO.
The TC poll is a good start, but could be simplified.