Hi No Signals,..............part no's as follows, std rings......
Ring, piston, No 1 groove, std........................7052068
Ring, piston, No 2 groove, std........................7052069
Ring, piston, scraper, std..............................7052070
if required, I also have O/s part no's........
(these no taken from feb '45 edition schedule of spare parts bedford mw models)
hope its of some help.
Andy