How to determine part numbers for optional lenses for the DS794Z

What are the part numbers for the lens of the DS794Z?

              Standard:

1. Broad ( OA80 ) 80 ft. by 50 ft.

2. Long ( OA200 ) 200 ft. by 10 ft.

              Optional Range:

1. Long ( OA120 ) 120 ft. by 25 ft.