left side is the length of connector wire, but you can still use a "right" solenoid on the left side. Solenoids are the same for both NA's and TTs. Just be sure to seal around solenoid with RTV. And since you've got everything apart you should replace those rubber half moon pieces too. They're only several bucks and having fresh rubber pieces that aren't dried out will eliminate one more potential area for leaks later. Places I listed earlier sells those too.