If it is No.0 MT you 're looking for then Sherline sells a full range of items. Eyeballed with a digital caliper my dead centre was .362", .320" over .848". They have a nice little revolving tailstock centre as well as a range of gear that can be offset to fix a tailstock height error for work that demands it. The prices are fairly cheap considering they are made in America. Usual disclaimers.
Andrew