70 Challenger 8 3/4 3rd Member Gasket Leak

[GoodysGotaCuda]

Probably overkill, but I used one of these when I went through my 8:75.

https://www.lubelocker.com/

https://www.amazon.com/LubeLocker-Chrysler-8-75-Differential-Gasket/dp/B07JQ4ZG36

Interesting, a gasket for the 8-3/4 doesn't show up on the Lubelocker website, nor is it on the summit website.

Discontinued?  Counterfeit?
The Print-O-Seal is a very good concept, and this is the first time I've seen it on an 8.75 gasket. 
Anyone have any history or experience with this gasket, and why it doesn't show up in the Lubelocker catalog?
Robert

https://www.ebay.com/itm/Chrysler-8-75-LubeLocker-Differential-Gasket-LLR-C875-Mopar-8-3-4-NEW/223033067108?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649

[schlett7nu1]

I purchased the Lube Locker gasket from Amazon.

[7212Mopar]

I kind of recall the axle oil seals are on the axles and the outer grease seals are at the housing?

[schlett7nu1]

After 4 months the Lube Locker gasket is leaking. Very disappointing. I spent a significant amount of time ensuring both surfaces were clean and free of old gasket material. I torqued nuts to 35 ft lbs. A days job all for not.