727 transmission with an ear or knob at the side? Help

Hi Guys,

I have a 65 NYer and I need to replace the transmission. Since it is hard to get parts here in The Netherlands I only have the choice of 1 transmission that is for sale.
In my car there was originally a 413 but since i bought it what an stuck engine i replaced it with a 1967 440.

That transmission has a sort of knob on the side while other transmissions have an ear on that same spot.
Can somebody tell me what the difference is?

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Author: Hotrodharbor