Lewmar standard pawl (up to 50st winch or so usually) 16.4mm long, 12.5mm wide, 7.8mm deep (the fat round bit)
Lewmar large pawl (over 50st) 16.6mm long, 12.5mm wide, 9.2mm deep
Dimensions taken with plastic calipers, usually sell for round the $5 mark each
Hope that helps