If your storage key has a white plastic coated square head on it and your door key has a purple square headed plastic head on it, then your local dealer should be able to match up your lock. Actually, there are only about 99 keys, all of them are numbered, and your dealer should have extras for sale for every one of them. I know ... we lost ours while on a trip last Fall.
If the CH750 did not work, then it's probably one of the 99 keys.
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2019 Montana High Country 375FL
2014 Chevy Duramax HD 6.6 - 3500 Diesel Dully Long bed Crew Cab
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