In my 30 years in the hobby, plus several years in a lfs, I've never seen a tire track eel with markings anywhere near those of my fish. I contacted fishbase.org, hopefully I'll get a response soon.
After looking through fishbase again, I think I think I may have Macrognathus semiocellatus. If it is, it stays small, about 7.75". Hopefully they'll still get back to me, at some point.