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Don't know, I just know the part numbers are different. Worked on an S with a ABS light sometime ago and found that right axle had been replaced with one that had ABS serrations in wrong place and didn't line up with sensor. Replaced right axle with 91L axle and ABS worked fine.
I ended up using wrong serrated axle on my non ABS 164B. I still wonder what car that axle was really designed for?
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Ciao, Alfisto Steve
Virginia Beach, VA
AROC 164 Tech Advisor
s.patchin@aroc-usa.org
http://www.aroc-usa.org/
Daily drivers: USA models 91 Bianco 164B 5-speed - ALFA 4ME, 91 Argento aka "Quik Silver" 164B w/AT 1QUIK AG, 91 Argento 164L w/AT aka "Quik Silver 2 - ALFA 4US and 93 Rosso 164L 5-speed - ALFISTO.
Rescue projects: Organ donor 91 Nero 164L w/AT and 91 "Old Blue" 164L w/AT
"A day without an Alfa whine is like a day without sunshine"
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