Taper roller as fitted to many Greeves models. 2" O/d x 1" I/d x 1/2" Deep.
This imperial bearing goes under at least 3 names LS8 / RLS6 / LJ3/4 Ball bearing. It fits 8D and 9D mains (3 in each engine) . And it's also fitted...
N205 Bearing, Known as R125 in Villiers books, or in some cases LRJ25 These are high quality bronze caged C3 tolerance bearings.
N304 roller bearing as fitted to all Siba start motors. Also know as R320