http://www.peachparts.com/shopforum/showthread.php?t=178765
both have the newer pencil type with a big base that fits the older cars like ours. the part number on the older ones has been replaced with another number(sorry don't have it right now) , but they are available. i just bought a new set about a month ago.
get an ohm meter and check the old ones , not just continuity, but OHMs, and see what they read. above 1 ohm is bad but it will test good the way your mechanice was doing it. should read .6 or .7 ohm. sometimes they test good with his method but they don't work, or not work right.
good luck

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Current money-pits:
96 Passat TDI
78 300D 100k miles(60miles/day)FOR SALE
91 Jetta Diesel 250k miles (80miles/day)
82 Toyota Diesel pickup 150k miles; out of service for a little while with a valve problem.
All on BelenBioDiesel
Past diesels:
01 Golf TDI
81 Isuzu P/U
85 Jetta
89 KW 425 cat
85 Pete 400 cat (currently still running the west coast with over 1.5 million miles)
81 KW 400 Cummins
77 Freightliner CO ???? Cummins (Buttercup)
57 180D lots of miles(gone but not forgotten)