You want the AQA thread, but any Campag size 1.320"×24tpi will work, either Campag or Phil.The Phil one is nicer and has a step to allow use with 12T sprockets, handy for mashers.
Also, sell the Sheriffs and buy some Novatecs, you'll be quids in, you'll have better hubs, and the Novatecs use, and come with, an ISO 1.290"×24tpi lock ring, plus metric thread on the axles so if you ever lose a track nut you're out about £3 rather than the £20/pr for weird 26tpi Campag ones.
You want the AQA thread, but any Campag size 1.320"×24tpi will work, either Campag or Phil.The Phil one is nicer and has a step to allow use with 12T sprockets, handy for mashers.
Also, sell the Sheriffs and buy some Novatecs, you'll be quids in, you'll have better hubs, and the Novatecs use, and come with, an ISO 1.290"×24tpi lock ring, plus metric thread on the axles so if you ever lose a track nut you're out about £3 rather than the £20/pr for weird 26tpi Campag ones.