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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jun 2012 Posts: 1,747 'Bolter | | 'Bolter Joined: Jun 2012 Posts: 1,747 | According to the manual: AC-104. According to Champion: New number is UY6. Autolite: P4 or Motorcraft Autolight PR4. Bosch: U145T3.
Now isn't that helpful? All of these are supposed to be the same.
This list might be more helpful, at least it has more options:
AC Delco M8
Autolite 3136
Bosch M8AC0
Bosch stk 7548
Champion stk 842
Denso U20M-U
Denso L14-U
Denso stk 6003
Denso stk 5000
General Motors 1559459Motorcraft BT8
Napa X581NGK CM6NGK A6NGK stk 5812NGK stk 1010
Prestolite 09-10-06
Prestolite 18-10-01
Stitt 82
Now it is as clear as mud. I hope this helps more than it hurts.
My best guess, and it is only a guess: The autolight 3136 is the right length. But both are on the list. Maybe the length is not critical? Some one will know, I hope.
Steve H
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