It sounds unbelievable, but there hasn't been an officially released red seeker jet yet, after all of the various Starscream/Seeker toys in the last 35 years.
A red seeker jet is mostly just a background cannon-fodder or miscoloured background trooper over the years, and didn't even get a name until Fun Publications gave it one (in one of their comics), in 2013.

Soon it could be given an official name and toy, with a listing found for a Generations Select Redwing toy.

No images yet, or official confirmation.