HmI bought a new spare Termi 2in1 a year or two ago.
The O2 blind plugs were also missing. I did mail Termi but and they did send me new hardware but still the O2 plug was missing.
The funny thing is that the Termi 2in1 I have on my PS does have the plugs.
......but I do not know if the plugs were supplied by Termi or not, since I did not install the exhaust system.
I wonder if the plugs are the same size for the Zard as the Termi.
I am guessing the PS in an earlier post means Paul Smart.
If so the bike has the 59M ECU.
That ECU does not "learn" anything.
As it is a Performance ECU then it is mapped for open airbox and free flowing exhaust.
The mapping could be improved. Either an "out of the box" remap by people such as Rexxer or you getting a wideband oxygen sensor then logging the air fuel ratio and making changes to the map to suit your bike.
EDIT - does it have a sensor hole in each header or just one and if so where?