I bought a 08522-B1010 replacement horn; why are there two different bolts?

Discussion in 'Gen 5 Prius Accessories and Modifications' started by Scott_R, May 11, 2026 at 7:43 PM.

  1. Scott_R

    Scott_R Member

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    I scanned the Japanese language install instructions through Google translate, and they confirmed they are supposed to be two different sizes: M8 x 25mm and M6 x 30mm. Also, the M6 has a Philips head.

    Of course, the instructions aren't meant for a Gen 5 Prius, but the install is for the high pitch horn to be on the left, with the M8, and the low pitch to be on the right (in place of the original, if I'm interpreting the install videos correctly) on the right with the M6.

    I suppose I can reuse the one existing bolt, but are there really two different bolts involved here--are the attachment points different sizes?
    horn_hardware.jpg
     
    #1 Scott_R, May 11, 2026 at 7:43 PM
  2. Hammersmith

    Hammersmith Senior Member

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    One of the new bolts(and spacer?) will be a match to what's already on your car. Use the matching one for the new location(passenger side) and reuse the existing one for the original side(drivers).
     
    #2 Hammersmith, May 13, 2026 at 5:54 PM
  3. Scott_R

    Scott_R Member

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    I don't think the old horn uses a spacer; the replacement has is larger, so I guess the spacer is used so it clears the mounting area. But the one spacer is also sized for the M6.
     
    #3 Scott_R, May 13, 2026 at 7:28 PM
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