Jason,
You need to install the SCA files using JSPM onto the Solution Manager Java stack. You can install both the Version 8 and Version 9 files at the same time. Then, when you complete the Managed System Setup Wizard for a Java system, Solution Manager will determine which version of Java is running, and then deploy the appropriate agent to the system. For the older NetWeaver instances based on Java 1.4, it will use the Wily 8 Agent, and for Java 5 / 6, it will use the Wily 9 Agent.
Hope this help!
Jason