I don't know what the dash numbers are about, but here's what I'm seeing.
According to one of the online Volvo dealer's parts list....
1340988 = Trans top cover gasket (M45/M46)
1340989 = Trans-to-bell housing gasket (M47)
380618 = trans-to-O/D gasket (M46) (and I assume Type "P" O/D)
3502462 = Goes on the forward side of the internal brake drum (Type P O/D)
3502463 = Goes on the aft side of the brake drum (Type P O/D)
Disclaimer: I've never seen any of this in real life. Just tried to gather the info from the online exploded views.
Hope this helps.
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