the big end is 30mm and the rod centre to centre is most definetely NOT 117mm! it will be 120mm. the inside of the rod can be either 37mm or 38mm. they are ususally 38mm.
but if you find a rod that is 37mm you just need a special thin roller big end bearing.
regards
Taffy
Taffy,
I thought that they were 119 mm not 120mm.