Corrrect installation of fuel filler neck gasket in trunk

[cv70chall]

Can anyone tell me how to properly install the rubber trunk floor gasket that holds the fuel filler neck? I cannot tell if it mounts from the top of the trunk floor or from below? Is it supposed to be bolted/ screwed down?
Any photos would be a great help!

Thanks

[HP_Cuda]

Since it's an Ebody and I just did mine in my Cuda I'm going to say it mounts in the top of the trunk and you screw it down.

[burdar]

Correct...it mounts from inside the trunk and is screwed down.  The screws have a captive washer and a philips head.  THey are zinc plated.

[cv70chall]

Thanks! Screw length? Maybe 1/2" or 3/4"?

[burdar]

Overall length is probably 5/8".

[shawge]

The fastener guide has #10-14 x .60" in the description and #10-16 x .60" in the table (looks to be a typo - not sure which one is correct.) 
The .60" is measured from the base of the head to the tip of the point.  The captive washer is .50" wide.

[HP_Cuda]

Overall length is probably 5/8".

Yep I used 5/8ths no problemo!