ZF 4HP22 tranmission servicing recommendations

[jbg]

My Volvo came with a large collection of service records and repair slips but in reviewing the large folder I cannot determine when the transmission was last serviced.Knowing this I think it prudent to drain the fluid and replace the filter. I do not have a green book for this information so naturally I do have a few questions:

1. Is the filter similar in appearance to the one in this picture? http://www.google.com/imgres?client=...1&tx=134&ty=90
2. When shopping for filters I've seem some come with and without a filling tube, can I re-use the old one on the new filter? If so, do I need a new o-ring or seal for the tube on the new filter?
3. What fluid should I use?
4. If I'm dropping the pan to replace the filter I plan to replace the same amount of fluid I removed. I reckon this is a decent method?

Thank you for the replies.