with no actual measured photos, I'd guess your lil fella to be 9.2 x 6.0
I'd recommend a 12.0 x 2.25
If your girth is approaching 6.5, I'd go with a 2.5 inch diameter tube
287084-1414725329-e81ebf22adb481d821032bc91b89eb2f.jpg
make sure you get the pistol grip pump as well as a gauge
http://www.lapdist.com/sizing.html
I'd recommend a 12.0 x 2.25
If your girth is approaching 6.5, I'd go with a 2.5 inch diameter tube
287084-1414725329-e81ebf22adb481d821032bc91b89eb2f.jpg
make sure you get the pistol grip pump as well as a gauge
http://www.lapdist.com/sizing.html