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04B169 is the Magic Serial Number
Even though the first digital Heat Siphon was shipped in 2005, the digital pocket was in all units made in early 2004 and beyond.
Analog Models withserial numbers starting 04B169 and newer should look like picture on LEFT and have a small Digital Pocket with a blank door . They will need the newer Digital Door with Harness Upgrade kit.
Older analog models such as the one pictured on right have no door and must use the External upgrade kit shown below
Digital Pocket requires Digital Door w/Harness Upgrade Kit
04B169 and Newer
Older Analog Models with NO Pocket require External Upgrade Kit
See Below Picture