New tires/rock chip protection

[SFSDFGT]

I’ve been meaning to replace my *gasp* original BFG radial T/A tires on my aluminum CSX4000 Series Cobra, and am finally going to get around to it this summer. Despite all of the warnings about why the billboard Goodyear’s are a bad choice, and even after reading every tire thread on the forum, I feel that I still want to give them a try. Worse case scenario, I am willing to replace them immediately if I hate them. I’m OK with that.

My questions are: (1) where is the best place to purchase them, and (2) what is the best way to protect the inner fenders/quarters from rock dents and chips from the inevitable flinging of projectiles from the stickier tires? I’m already planning on doing some paint protection film for the exterior paint, on the anticipated impact zones, but with the aluminum bodywork, I am worried about how to protect the areas within the wheel wells. Foam? Peelable undercoating spray? I would prefer it not be too visible/noticeable, and it would need to be reversible so as not to affect the value of the car.

Thanks in advance for your advice!