I have a 722.409 from a 190E 2.6 that I am selling to a guy who will have it installed in his 300E 2.6 which also has the 722.409. What should he replace?

I know he should replace the filter and pan gasket, dip stick tube o-ring, transmission mount, vacuum lines going to it, and the transmission cooler lines, but anything else?

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.