"Are you sorted on this yet buddy ?" Got what you're after here .... in abundance. £5 to your door.
TIP: be careful with 1inch push-fit stuff for headsets. The lower headset parts you are after have slight differences in size for the part that sits on your forks. Campagnolo's are very tight on some forks and need the forks polishing down to get them to fit. Equally some forks are loose fitting on the same headset part.
Don't know what the differences are in size, we are talking thousands of an inch, but I have split a Campag on a set of forks, and had a Shimano slopping round on the same forks.
Slopping causes the bike to shudder when you brake because the headset is ever so slightly slack. Some folk use aluminium foil to fill the slack. Don't want to overly concern you, just bring it to your attention
Had most of my headset troubles with old Raleighs ? Perhaps someone in here can put all this info in better context with their wisdom
Take care, yours Laz.