non keyed sliding patio door mortise lock. offset thumb lock. 45 degree turn

This looks like our 82-218 Mortise Lock to me, as well as the 89-020 keeper. See if you concur. 

The handle set sure does look like our 82-089, or if you prefer a keyed handle set, our 82-086. Unfortunately the thumb lever sold alone, our 82-107, indeed only comes in white. 

There's really no distinction we recognize between those old product does; they just depend on the exact manufacture and the date of manufacturing. Ultimately we find they often both appear with Legacy type handle sets like the 82-089 and 82-086.