3500lly

I'm going to put some gauges in my truck and was wondering if the gauges and holders are all a standard size. Some of the gauges are 2" some are 2 1/16" and same with the holders but some of these sites don't specify what size the gauges/holders are. Does it matter/how do I tell the difference if it's not specified?

53 willys

"most" gauges are 2-1/16" that fit the pods for our trucks. I don't think Isspro or Dipricol make any other gauge sizes except the 2-1/16"
I know Autometer makes a bunch of different sizes tho.
if you cant tell from their site you may want to call them.