not real sure on the astoria, but i would imagine its close to the tuscany
however mine is right above the exhuast dpf filter, looks to be a pita to change,
its a huge cylinder on a flat metal support.
hope it helps
USN Retired, Life time member of the DAV.
Enjoying the 2008 Damon Tuscany 4056, #3998 no your eyes are fine, there are really 6 slides
2016 Expedition or 2012 Edge toads