Load balance based on port

I have a GTM -> LTM setup and I need to allow both port 80 and 443 traffic to a server. My initial thinking was to create two virtual servers, one configured for 80 and the other for 443. The question then is how do I load balance traffic based on port?

 

 

I'm using F5 to offload my SSL load from my WebSphere box.

 

 

Thanks for the help!