Vintage small hole key

Cougar Community Classic Cougar Community Discussion
1

Need a trunk lock and key for trunk. I have never given any thought about the small hole key? I haven’t gone around and checked to see what type of key my cars have. Would someone want to give me the lowdown this small hole key business. Thanks

2

Small hole lock set as original:

Lock set on eBay

3

Big hole keys as used in the mid 1970’s - and later:

Big hole lock set on eBay