Right-
1- You are missing a Pace specific part known as a Race collar. The steerers on Pace forks unlike most other forks to not have a tapered larger diameter section at the base by the crown, for this reason Pace used a shim (the race collar) to bulk out the steerer and make your headset lower race fit. If you removed an old headset, check the lower race that you removed as the shim often comes off with it. Pace or the ever useful retro bike member Justbackdated can supply a new race collar.
Your headset isn't missing anything, your fork is.
2- The part marked TH industries is part of an FSA Connix, an alternative device to a star fangled nut. If you do not have the specific top cap for it, simply remove it and install a star fangled nut instead.
1- You are missing a Pace specific part known as a Race collar. The steerers on Pace forks unlike most other forks to not have a tapered larger diameter section at the base by the crown, for this reason Pace used a shim (the race collar) to bulk out the steerer and make your headset lower race fit. If you removed an old headset, check the lower race that you removed as the shim often comes off with it. Pace or the ever useful retro bike member Justbackdated can supply a new race collar.
Your headset isn't missing anything, your fork is.
2- The part marked TH industries is part of an FSA Connix, an alternative device to a star fangled nut. If you do not have the specific top cap for it, simply remove it and install a star fangled nut instead.