In an e-mail to me Rob said:
"I measured the hole and as you said. The clock hole is 2.5". The plugs I have are 2.5" but slide through. I need one the would be 2 7/8" outside diameter. "
I replied:
"Rob, All my dashes are plastic , with a vinyl overlay. If I measure from the backside , measuring only the ID of the hole in the plastic and ignoring the thin vinyl folded into the hole from the front I measure:
Smaller holes like Oil pressure, etc : 2 -1/16"
Plug diameter incl chrome bezel: 2- 1/4"
Clock hole : 2-3/8 "
Plug diameter, inc chrome bezel: 2- 9/16"
If the clock hole in your dash is close to 2 -1/2" I think it was cut oversized and no standard Rootes plug will fit.
I also have a clock and it's outer dia , incl bezel , is 2-9/16" , same as the plug. So buying a standard Rootes / Alpine clock will not solve your problem."
Tom Hayden