WARNING!!! DO NOT BUY THIS ITEM!!!!! 
Global Performance Products has FUGGED UP by listing this part!!
As suspected, the sway bar was NOT made for our Solara, but instead, a Camry! After going back and forth with the manufacturer (Whiteline) they concluded that GPP sold me a part that DOESN'T EXIST!!
"BTF83 is listed for Toyota Camry A-MCV36R, not MCV31 which is actually a different chassis. Looking at your photos and the suspension manual, it is clear that BTF83 is very different to your original swaybar. Frankly, it is so different as listed in your first email that I am surprised that it has even been installed on your car.
Unfortunately, I can only advise you that you remove your swaybar and re-install your original unit, however since you have repainted your Whiteline swaybar in a different colour, I am not sure if your supplier will be able to process a refund for you. Perhaps you can talk to your supplier for possible other alternatives, but at this stage we regretably are unable to help you.
Let us know if there is anything else that we may be able to assist."
So I have inquired about how they might go ahead and make one for our rides, but they said I have to talk with GPP about it since they are the only authorized US importer for that line of parts (but hinted that they typically want an order of 20+ parts to do it).
Luckily, I haven't yet flamed GPP about this yet - though I have CC'd them on all my correspondence with Whiteline, so they know what's going on right now.
Let's hope we can use this at our advantage and get them to push through a GB order to get Whiteline to design a REAL working sway bar for our rides!! This mis-hap may turn out to work in our favor after all...
KEEP YOUR FINGERS CROSSED!! 