I received 3 of mine last month and will get the rest at the end of this month. Perhaps you may consider picking up the phone and talking with them. They (3rd party processors based in AZ) very helpful with me.
Doing business with RA can be a crapshoot and annoying. My last order for a non-closeout windshield washer pump came missing a hose (which I did not need thankfully) and was already opened, clearly a return. If it weren't for the beer-fridge magnets, I'd be gone. ;)
Ingenious. However might you be pulling a lot of grass and dirt into the oil cooler fins via the draft of the flywheel? Some type of pre-filter now may be required.
I've never understood why AZ & AAP handles clearance items the way they do, i.e. with not much transparency to the items available on clearance. Maybe when you have 6700 & 4800 stores, it's difficult to manage. You have to be an internet sleuth and a disciple of this forum to even have a shot...
I called the rebate center today and got some cock-and-bull story about how the "holidays" have put them behind. A stated 8-10 week turn period will now be 20 weeks at best. As previously mentioned here many times, rebates are a PITA.
I used this in my E39 w/ZF5HP24. It was very sensitive to fluid level, shifted like pooh when cold if fluid level was not perfect.:
https://sharena21.springcm.com/Public/Document/18452/66447451-fe75-e711-9c10-ac162d889bd3/56a3517a-e29c-e711-9c10-ac162d889bd3