I've finally managed to fish out one of my old formation pictures.
This one is a [very] loose formation of 3 Grumman American AA1C aircraft in early 2005. When this photo was taken we were a few minuites south of Ardmore airport heading to New Plymouth [then on to Foxpine then Motueka]. Aircraft are ZK-FVS, ZK-FPA and ZK-FVA, all from Auckland Aero Club.
The camera ship is a C172N [ZK-ELU]. I'm in the lead Grumman.
Below the formation picture is a close up of the Mighty Grumman.