what is the champion cross reference for a briggs and stratton spark plug 691043
Per WIX website cross reference, Briggs & Stratton 492932 = WIX 57035.
It is the same as the Briggs & Stratton 492932 and the Fram PH8170.
The Briggs and Stratton 492932 filter it cross over to a Z87A RYCO filter
Champion RC14YC NGK: BCPR5ES