I think Dave is correct....
The 2005 A-arms/tie rods were one year only (sway bar too)
The Holz spindles work with the 2005 - 2009... same spindle... The only difference is that the 2005 is spaced a bit closer which would indicate a shorter Tie Rod on the 2005 model.
The ski center width is the same on the 2005 - 2006, the spindles on the 2005 make up for this on the shorter 2005 arms.
The 2005 spindles were strange looking, heavy and had the worst geometry of all the spindles... I believe that that the a-arms were lengthended by 1/4" (each side) on the 2006 and up models.. The lower a-arm end forging looks identical betweent all the years on these sleds... probably too expensive to completley re-tool...
" WIMPY " on this forum makes/sells tubular tie rods in any length that you want for about $22 each. Look him up on the members list.
I have to lay the 2005 2007 2009 arms that I have here next to each other to find out the difference...
I believe that the 2006-2009 A-arms are the same... the 2006 is silver (or red), the 2007 -2009 are black... thus the different part number.
As for the swaybar... the 2005 part number is a "one off year" as well, Even the larger swaybar kits that Carl's sells have different kits for the 2005 sled.
According to the Holz instructions for their A-Arm kit that fits 2005 - 2009 IQ's... the 2006 - 2008 & 2009 wth the rear mounted swaybar, is 1/4" longer on both sides.
From Holz A-Arm installation instructions
7. Cut 1/4” from each end of the sway bar (2 cuts) if installing on a 2006-08 model. Do not cut on a 2005 model.
The 2005 was the test mule chassis for the IQ... the refinements were made.
from 2006 -2008 it was spindles and suspension paint colors that changed...
That's my 2 cents.
I'll be doing some front end work on a 2005 900 this week and will compare all the different yearfront end parts (2005. 2006, 2007/08 and 2009 ) and post my results