I am looking for Big End Connecting Rod Shells for my 4/3 have measured the big end and that is 28.20mm. Have you any that will fit?

These should be the correct ones for your engine as long as it has not been altered: https://www.lsengineers.co.uk/big-end-shells-standard-size-to-fit-jap-4-3-engines-18474-std.html