Fixing in dash warninfg lights.

[Pink_Floyd]

Just finished re-veneering my dash and am now re-assembling it. Gauges are easy, but the aluninium warning lights we held in with what look like 'shakeproof washers'. Anyone know what size I need to put it back together or a better way to hold the aluiminium bits in the dash.
Also I am after another aluminium warning light if anyone has one, legend on it does not matter.