[ZeGermanHam]

As the title states, why are the left and right rear inner wheelhousings a different shape from one another, with the driver side having a squared off rear corner? What is the most reasonable theory for why GM did it this way?

[Cardo]

I think that may be there to facilitate the filler neck on the station wagons. Then they could use the same wheelhouse for both styles. Anytime the manufacturer can eliminate a part number, they save money.

[RedDirtRoad]

They make inner and outer wheel housings separately as well as a complete 1 piece wheel house
I thought I only needed outer wheel houses but as I got into the car and discovered more rust I needed inner ones too
My advice to you is to buy the 1 piece housing for a little more money and just cut what you need
The 1 piece housings fit better with less work

[Jeff Hamlin]

As mentioned it was so the same DS unit could be used on all models.
Including the wagons, it indeed was for the filler necks used on the wagon.

[ZeGermanHam]

Thanks for the info, guys. I figured it would be something like that. Fortunately, I don't actually need to replace the rear wheelhousings on my GTO, but I was curious nonetheless.

[goatwgn]

Makes sense. I have a '66 wagon, and the filler tube passes right through there.

[66sprint6]

Here's an official GM cutaway display, highlighting the wheelhouse detail in question.

[MecGen]

Originally Posted by ZeGermanHam

Thanks for the info, guys. I figured it would be something like that. Fortunately, I don't actually need to replace the rear wheelhousings on my GTO, but I was curious nonetheless.

I was just in my trunk mucking around and was thinking " why are they different ?" And boom I found my answer.

Thanks !

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