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I bet if you look for 2.5s in a 4-6" lift you will find them just compare to the b110 compressed and extended lengths

 

What are we betting?

I posted a screen shot of the 2.5” options. It’s the same part # that the OP had plus/minus adjusters.

 

Hmmmmm I will bow out of this one. Unless one of the DB lift companies has them made specifically for them and they aren't listed on their P/N then. Your initial comment about Fox not making an extended travel is was what I was pointing out that they do just in the 2.0 series. I will say that you're 100% correct on the 2.5 series not having an ext travel option though.