Hatch Handle

[Mr Banshee]

Hello all I just recently joined this site and have found it to be a wealth of information. I have a 1972 Blazer that is in need of a complete resto. For the time being I have been fixing areas of the truck to make it somewhat road worthy just to toy around. Currently working on the rear hatch deriggin it that was held closed with tie downs. Repairing hinges and locating missing parts for it to become operational. One of the problems is the hatch handle; it doesn’t have a key to it and is in poor shape. I’ve read some information on here but have a question how to determine if this an OE piece or just a run of the mill handle from a pickup topper or garage door. I’ve units on Ebay that claim there NOS pieces but show keys with them that look like garage door keys. I’ve found information on this site that GM used the ignition and door keys to operate these locks which contradicts Ebay’s pieces. So is there an easy method to determine what type of handle you have and what type of key should it use?

Thanks, Mike