Looks like the 1st one is a variable orifice tube, which does have some advantages over a fixed one like possibly improving performance at low RPM. I put a variable orifice tube in my '98 when I replaced my accumulator, I didn't really see any difference. It works better than it did before with the OE fixed orifice, but the AC wasn't working 100% properly to begin with due to the accumulator leak so its not really a true comparison of equals. I mean, it works great, just not sure if the variable orifice tube really made any difference or if it would work just as well had I replaced it with a new fixed tube. I'm not going to change it again either way.
AFAIK, the orifice tube is in the same location on a '03+ as it is on a '79-'02, it should be in the lower line going into the evaporator housing. There's a quick disconnect fitting where the AC hose attaches to the evaporator and the orifice tube is in the evaporator side of that connection.
-Steve2006 Audi A6
~132k miles, stock.1998 Mercury Grand Marquis LS HPP
~100k miles, slowly acquiring modifications.1997 Town Car Cartier
~145k miles, Ported Plenum, Gutted Airbox, Contour E-fan Retrofit
, Dual exhaust with Magnaflows, cats deleted, MSD Ignition
, KYB Gas-A-Justs, P71 front bar
, air ride reinstated, Projector retrofit, Caddy 4-note horn retrofit, Wood rim steering wheel retrofit, holistic weight reduction as the parts fall off..1996 Mercury Grand Marquis GS
117,485mi. R.I.P. 7/14/12