Looking at the parts listing, the parts appear to be consistent across all Vectra/Horizon models for a given year. There seems to be a new number for the 2007 door check kit as well which matches the part RVQueens got:
54 128913-15-713 EA DOOR CHECK KIT W/HOUSING 491109
The GUIDE BLOCK number seems to be unchanged.
In 2008 they went to the external hinged door check at the top of the door.
I just replaced my original 2005 door check with the 2007 version (128913-15-713 EA DOOR CHECK KIT W/HOUSING 491109). I could detect only two differences comparing the new parts to the old. The original flat metal piece had a slight bend in the end near the door jam--I can't tell for sure whether it was made that way or was bent in use, but RVQueen's earlier picture showed a similar bend. The new aluminum spring tensioner block now uses a rubbery yellow/brown plastic spring material instead of the original blue metal springs. Other than that the parts looked identical.
The original flat metal piece had a slight bend in the end near the door jam--I can't tell for sure whether it was made that way or was bent in use, but RVQueen's earlier picture showed a similar bend.
My door hinges resemble Western Diamondbacks somewhat! Time to replace them, thanks to gusty winds and a defunct door check mechanism. Door check mechanism will also be replaced.
Question... Have any of the above folks changed the hinges? If so, any hints, other than do one at a time? Since my door swings out more than 90 degrees now, I plan on chnaging the hinges first because I can get a better angle on the half of the hinge that attaches to the door.