Hi a pe400 conrod has the marking numbers 409 cast about half way upthe rod and a number 3 near the little end with 3 little dimple dots cast next to the 3. Check the part number again as suzuki has 5 numbers in each part of the part number it could be part number 12161-16500 which is a tm-ts 400 conrod I havn't one to check the dimensions but they sound about right as the tm 400 rods are very similar to the rm500 rod Rick Horvat has used them in rm500 cranks with extra shimming in the big end and bores the little end out to 20mm I think it is to accept the tm400 little end pin as the centre to centre length is the same and the big end pin is the same diameter,hope this helps,cheers