This is an BSA A10 Conrods, small bearing crank. These are not A7 and these are NOT big journal distance between centers: 16.5 cm small end bush size 19 mm Area to take the shells is 40.5 mm
Norton 600/650cc Conrod Pair used
One conrod number AL747 on the other Side is T1
The second conrod number AN378 on the other side is D2
Both end casp are numbered T2149