Most bikes/headsets for sale on ebay tend to be 1 1/8" now,the 1 1/4" is a lot more scarce,some manufacturers still make them though,ive been after parts for mine for ages,they dont arise that easily :cry:
i had the old sizes on my orange and sliped in i.d. spacers top and bottom of frame head so i can fit in a 1 1/8 size headset forks etc all working ace now cost me £18 for parts ...someone on here will say they are runbbish now and shatter my bike build ... working fine tho for me ratty aluminium o allmost built
My Gary Fisher has a 1-1/4 inch headset it is a chris king and I'm sure they still sell em albeit I can only find them in the states and needless to say they cost too much money
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Chris King also makes a headset called the "Devolution" which fits an 1 1/4" head tube but allows the use of 1 1/8" forks and stems. No shims or reducers required and the thing isn't any more expensive than a normal King. Plus lets face it, it will be the last headset you'll ever need to press into your vintage ride.
I've got one on my Cannondale Beast and its a dream.
The 1 1/4" headset size was only around for a few years in the early 1990's, with most everyone changing over to 1 1/8" headsets by about 1995. The Chris King headsets are very well made, although I wore one out in 3 years on my current bike. The good news is that I sent it to Chris King and they rebuilt it on warranty for free!