Ok, since I always frown uopon posters that talk about trying something and never pull through.... I ordered a set. I measured my springs and found that the interior width is about 4.25" and the interior height is about 7.5" from perch to perch. Inputted into their "choose my set" forum at
https://www.airliftcompany.com/works...ir-spring-kit/ and it came out with 60909, 8"long, 4" wide. They say its better to undersize the width a big than oversize, and emphasize that it will cause premature failure to oversize the width. There's a chance I should've gotten the 7" but their site said go with 8, and they have a lifetime guarantee on the product.
So, they should get here Thursday. I'm towing about 130 round trip to the track this weekend, so I'm going to see if I can get them installed before that. Still have some things to do to the track car before I go. I've got another event 2 weeks after that, so I wouldnt be too worried about running it as is for one trip, and then with the bags the next trip, as a comparison on the handling of the load. Regardless, when I get them, I'll post up some unboxing pics, and then I'll take some pics whenever I get aroudnd to installing them. As far as I can tell, I'll be the first person documenting aftermarket bags on a non SLS e70! Go me!