I am installing a roof rack on my 2008 Yaris 2 door hatchback in order to carry heavy downhill bikes. Thule has two options on their fit guide:

Option 1:
400xt footpack
2196 fitkit
lb50 loadbars
477 short roof adapter - this spreads the loadbars further apart to stabilize loads.

Option 2.:
400xtr footpack
2196 fitkit
arb43 aeroblades

There is no short roof adapter in option 2. The aeroblade bars would be awfully close and potentially unstable. Is there a way to use adapters and install the 477 short roof adapter with the aeroblades?

I'd prefer the aeroblades for the mpg savings and the quieter ride.

thanks