I’m afraid I don’t have an answer to your question but I congratulate on your choice of vehicles. I have a 2005 MR2S myself.
Here’s another oddity. 20 years ago I used to deliver mail in Cottonwood. My last route was up in the Camelback, Cardinal, Promenade area.
Little Cottonwood Canyon will be a real hoot for you now!
You might want to check out this website.
Spyderchat.com: The Online Community for Toyota MR2 Spyder Enthusiasts! has a lot of good information for you.