Master Cylinder Gaskets. I must have a different reservoir than most.

[73chgrSE]

My reservoir must be unique because the only replacement gaskets I can find are exact opposite from mine. Local part store have these by Dorman. I searched Dorman's website too. As you see they have the small part towards the rear, squared end. Mine is opposite that. I'm 5 pages in on eBay searching.
Anyone know a place that sells the one I need? I just went to a car show yesterday and every MOPAR had the opposite kind than me.