According to my invoice from the local dealer on 11/00, my '85 300 TDT had the oxidizer replaced with a catalyst, part # 126-490-34-14. Vwbudge is right, they look identical, so much so that I later went back to the dealer to verify that I didn't need a new trap. On an earlier invoice (dated 3/96), before the new cats were being retrofitted, as part of the regular 30K service they replaced part # 617-142-02-94 with what was described on the invoice as a "soot filter". Sounds like you have the old oxidizer.

Nothing like having records from day one.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold