If you bought two singles, then you got two single plates. You could have bought a double back-plate, separately.

The numbers on back of back-plates are model number, NOT a serial number.

Jeff
(Written on blackberry, from airplane)

: Jeff thank you for your response. If the timers were sold in a pair
: would they each have there individual back plate, a one piece
: larger back plate to fit 2 or 3 on and are the numbers on the
: back plates unique to each one produced like a serial number or
: is it a common number found on multiple back plates you have
: seen.

: thank you again

: Jon