I have uploaded a few pics of the top of the tank of my 410 dating back a good few years to flickr. Apols I couldn't attach them here.
Have done more work since but this was as it came to me from the factory, so it's as close to an original reference as I have.
Mine also had fuel smells, traced to a leaking fuel sender. Turned out only 2 of the 6 screws had threads. Fixed a few other things (kink in the reserve feed pipe) while we had the tank out.
https://www.flickr.com/photos/107289...h/51641009312/
(scroll to the end)
Good luck with yours!