Isn't that the same Stromberg used on Triumphs, MG's, and so on? Check eBay, or hit some British car parts guys. I have a friend in IN who wrenches on TR's and has several parts cars and piles of parts. Bet he'd have one on the cheap if need-be.

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)