In this video I speak about catches when replacing Mercedes G (W463) transfer case output flange seal.

Seal: A 015 997 08 47 (~62 EUR one piece)

Flange to driveshaft bolt: A 319 990 06 01 (~3 EUR one piece)
Flange to driveshaft self locking nut: N 910113 008007 (~2 EUR one piece)