I need a seal and clutch kit for my HSW630VI 2.5.. Which one should I get?

3312199021 is from ZF Marine directly.  ZF Marine
purchase the Hurth transmission company back in 1996 so the ZF 63IV is the same
as the HSW630VI.

This kit includes the complete gasket and seal kit (3312199020) and the clutch kit with
all the clutch discs.

MMD 3312199 is from an aftermarket company that puts the kit together
using ZF Marine parts and a few aftermarket parts.   We have used these with no issues
but the ZF OEM kit is probably better overall.

Volvo Penta purchases the kits from ZF Marine and then renames and repackages them.
So the 877095 is the ZF gasket seal kit 3312199020) while the 877098 is the seal and clutch
kit 3312199021.