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I think they might be the same. W8AC is the newer number. The old number used to be W145T1 or W175T1 depending on the heat range. Russ Wolfe russw@classicvw.org http://www.classicvw.org/ Subject: [T3] Spark plugs.. W8AC/121 145 > What is the difference between the W8AC Bosch plugs we use and the Bosch 121 > 145 That I have a box of ?? They look the same. > ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe