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Johni have 2 reliable books with the M116 size listed,one says 1 1/2 x 2 3/4..the other one says approximately 1 1/2 x 2 3/4,so i guess there must be some tolerence because they dont give an exact measurement....i have one and the size is 1 1/2 x 2 3/4....i hope this helps,John