Yes the pic came from a on line parts lists for the F2, F3, and F4 Z650s.
z650.surr.fr/parts.html
Here are the part #s that I have found for the grab rails that were stock on 650s As I understand it the grab rails for the D and E models are different length than the one used on the B, C, and F1 model.
32109-016 - one on each side
KZ650-B1 (1977)
KZ650-B2 (1978)
KZ650-B2A (1978)
KZ650-B3 (1979)
KZ650-C1 (Custom) (1977)
KZ650-C2 (Custom) (1978)
KZ650-C3 (Custom) (1979)
KZ650-F1 (1980)
32109-1025 one piece both sides and back of seat
KZ650-F2 (1981)
KZ650-F3 (1982)
KZ650-F4 (1983)
32109-1002 - one on each side
KZ650-D1 (SR) (1978)
KZ650-D1A (SR) (1978)
KZ650-D2 (SR) (1979)
KZ650-E1 (LTD) (1980)
32109-1016 one piece both sides and back of seat
KZ650-H1 (CSR) (1981)
KZ650-H2 (CSR) (1982)
KZ650-H3 (CSR) (1983)
KZ750-H1 (LTD) (1980)
KZ750-H2 (LTD) (1981)
KZ750-H3 (LTD) (1982)
KZ750-H4 (LTD) (1983)
KZ750-M1 (CSR Twin) (1982)