I've got an 05 TB that had UQA BOSE NAV as stock equipment. The 05 TB is NOT a "LUX" BOSE system. The original Factory BOSE NAV unit in my truck was part number 15229287. ( Another more common part number for 05'+ TB/Envoy compatible BOSE NAV = 15800000 )
UQA in TB/Envoy = BOSE. (UQA does not = LUX vs. NON-LUX ) LUX BOSE was used in the early TB and Envoy; I always find LUX BOSE amps in 02 & 03's, but heard stories that some 04's were LUX too.
Other GM trucks with BOSE used LUX vs non-LUX for different year ranges than the Trailblazer/Envoy ( Yukon still had LUX in 06' for example ) so stick to searching for the correct non-LUX head-unit part number for your 05'; regardless of what it was pulled from.
Have you found a NAV unit for your truck yet,... or are you still looking ??