Just checked current availability of various gaskets for transmission.

For M47R/R II
1340993 (diff to 5th.gear case) still available from dealer £5.60 + vat. (Classic part)
1340991 (side cover plate) still available from dealer £6.10 + vat. (Classic part)
1340989 (front cover housing) still available from dealer £6.60 + vat.
1340992 (main to 5th.gear case) still available from dealer £6.10 + vat. (Classic part).

For M45R
3212291 (diff to main gear case) No longer available.
1340988 (side cover plate) still available from dealer £7.10 + vat. (Sp.order Sweden)
1340989 (front cover housing) still available from dealer £6.60 + vat.

B172K rotor arms 3449620 still available @ £15.60 + vat.

Mac.