ZALMAN CNPS9500A-LED on 1155 with no backplate

i see no backplate on the newegg pictures. just follow the manual

The manual only shows how to install on a 775, and it says to use the 775 backplate.

Everything fits and will work, I'm just worried about the mobo.

When did you buy the cooler?

"Note: Customers that purchased coolers before the inclusion of support for socket 1155/1156, can purchase the separately sold ZM-CS5A or ZM-CS5B mounting kit for installation onto socket 1155/1156. The mounting kit ZM-CS4A can be purchased separately for installation onto socket 1366"

I bought it before 1155, thanks for telling me about the mounting kit. Would it work on 1155?

Edit: I just looked and it's out of stock, but would work for 1155. Should I install the heatsink without it?

I would ask Zalman customer support.