Take a photo of the rear axle housing (or as much as the entire rear axle as you can). I want to see what you have. The 7.5/8.2/8.5 all use the same rear wheel seal from what I found and what you ordered is the right one for those axles. Also, please get a straight on photo of the axle end and the axle you have out where the bearing rides.

 

Here are the photos I have on file.
The old part I have seems to be a regular seal that I can get from seal manufacturer or dealers but I would like to understand why the regular Camaro seal do not fit so I really appreciate your help.
As you can see the new eals is the same diameter as the outside diamter of the housing.
I wiull have to go back to my garage for other pictures if needed.

 

It should fit. Socket the same size as the OD or as close as you can and a hammer should get it in with little trouble

 

I will try to hammer it in place but I feel like the red part around it will not fit.
Now this does not explain the difference with the original set up I had there??

 

Use block of wood across diameter of seal and Ford tuning tool, aka BH.

 

OK so no way to hammer it in place. The part where it may slide is 2.293", internally the gasket is 2.225", much smaller AND it has a lip that close it to 2.173". Definitively a gasket that must slide in a female socket rather than ride over a male.
Now after looking closer with another pair of eyes belonging to a clever than me friend, we noticed that it looks like the 2.293" sleeve is not all the way in place as there is a gap left behind it.
Should this sleeve slide further down, it would leave place for the gasket.
See the sketch below, hope it can make it clear.
Of course there is no way to slide it anyfurther so I guess I will replace the gasket that came with the car with same size gaskets that I found locally. It worked fine before so should be fine again.

 

Yes, on the right - install to full depth.

 

Yes but previous owner didn't did it to the full and I see no way to push it down.
I may have to remove it altogether and restart the installation but I may end up with a worst than better situation.
I'll have to think about it.

 

I would pull everything out so you can see what you have. How does the axle look? If it's in good shape I'd get a standard bearing and install that. I'm wondering if it was a repair bearing and the seal portion came out some how.

 

Agree with MK, remove and start over.
Emery paper the bore, clean with WD40, place new bearing in freezer, coat new bearing outer side of outer race with silicon grease.