Look at the emission sticker under the hood Itll say If not go to a GM dealer with a copy of the entire VIN and they can tell you
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The Geo Metro was the only Geo to have a 3cylinder engine.
It all depends on the size of the engine, but there should only be one.
I believe Chevrolet
1.6
6.5 inches
For my 94 Geo Prizm it's a 30mm.
Answered by this question:Using the vin numbers to tell which model Geo Prizm you have?
'The 8th digit is the engine size. The 4th and 5th indicate the car line. On a 91 Geo Prizm SL is the GSI , SK is the SLI model. '
You need the radio unlock code in the radio manual
Factory manual says 0.031, not 0.042.
6.5 in the back