Need to add the port number into the back end http request

I have a client that has an Oracle application server running on 10g r2 (10.1.2) an I am migrating a Zeus config to LTM. The server listens on port 7777. I put in a simple HTTP redirect to HTTPS that works fine, but Zeus has request traffic script that specifies:

http.setHeader("Host", http.getHostHeader() . ":7777");

I assume that this inserts ":7777" at the end of the host header for the back-end requests. How would I accomplish this on LTM 11.1 HF3