Keep the alternator OE style. Here is my argument. I needed an alternator for my 1972 Duster. It was Saturday at 6 pm. I live in a rural town and my local Advance Auto is open on Sunday. I called them that Saturday night and they had the regulator in stock local for like $25 and could get me the $88 OE style 2 groove Car Quest alternator by 9 am the next morning from one of their nearby stores, on a Sunday… Last I checked I can’t get one faster than that ordered on a Saturday to have on Sunday before noon in a rural town in WV. All in including just eating the $10 core charge I was less than $130 for new alternator (60 amp) and regulator, and they bolted right in, no adapting. Every other alternator requires adapting and is generally more expensive initially.
I do agree with Summit and Amazon usually have parts in 24-48 hours and have gone that route too, and Rock Auto is usually about 2 to 3 days to get here but still a great choice. However all require shipping, which is a cost, and if it’s wrong you can’t just refuse it on the spot. So all of these are excellent options, but the key is you have to have OE style part for something to get it that quick, so why fight Ma Mopar on this one? Do you really want to stand there and try to remember what other car your alternator is from because it’s not a failure that comes up very often once you install it and you can’t buy any auto part without “what is this for?” because there are few parts guys any more, just enter make and model and hope it’s there, and not all cross references are in the computer…