My next choice would have to be the HL tiger1 track which measures 1.75 which would be wider. But if I clip off the little tab on the one side it would come out at 1.625" so .025" over would probably be close enough.
Here is a scan of the HL 1/16th scale tiger1 track un-altered
Here is a pic of the proposed trimming of the track. The first 3 white lines is one option the second 3 lines is another option.
What do you think? It's about as close as I'm going to get