I'm posting this information just in case someone needs to know what gaskets (o-rings) are needed for Comptech headers. The Fel-Pro gasket number is 60517, so you can go into any parts store and ask for a Fel-Pro 60517 or equivalent. I also found these part numbers for Honda, but I don't know if they are accurate:

OE Number 18393-SA0-000
OEManufacturer HONDA
OE Number 18393-SH3-S00
OEManufacturer HONDA

I guess these o-rings are the same size as ones used in the Honda V6s from 1980-95 (that's what it says on the packaging).

 

 

I should clarify that all three of the connections (the 2 collector-to-downpipe connections and the header-to-cat connection) all use this gasket size.

 

Thank you for the info, I have been looking for these parts, CT-Engineering wants $10 per gasket and I was hoping I could find an alternative.