the Personal Six (Cedric) of the mid sixties used a predecessor of the L series that Nissan inhereted from Prince in their merger, not sure of the designation though. They had both 4cyl and 6cyl variants. The '69 on models were released with L20A in some variants.

the other vehicles I know that the L20A was fitted to were some Nissan Fairlady Z's, C110, C210, and R30 Skylines. I suspect it may have been the engine in an obscure 610 model that was released with a 6cyl L series, but I haven't been able to find much about that car. there were probably other models it was released in as well.