I imagine that RK builds the lifts as they are ordered in order to keep down overhead costs from surplus inventory. Also, RK has their "standard lift kits", but can also swap out components to the customers wants.
i.e. For a while, they had the RK 3.5" X-Factor lift, which many customers would order, but request the 2.5" springs be installed instead. Recently, RK has just created a "standard" 2.5" & 1.5" X-Factor lift due to demand. And RK RRD shocks can be custom tuned at the factory before they are shipped.
Just hang tight, the 1 week wait may feel like a long time, but it will be worth it once you have it installed. I believe you will be pleased with the results.
2008 2-dr Rubicon, auto,
RK 2.5" Max Travel, Rancho 9000XL shocks, 37" Nittos, 5.38's, RR skids, Warn VR8000-S.
RIPP Gen 2 Stg 2 Supercharger.
Political Correctness offends me.