SERPENTINE IDLER PULLEY

[silky]

I am trying to order a new serpentine idler pulley for my 1992 SHO. Ford parts network wants to know if it is for a 4 rib or 6 rib belt. Anyone know which pulley would be the correct one for my car? Thanks for your help.

 

[sdpatt]

There are two belts on the 3.0L, MTX SHO engine. The alternator-A/C belt is a 6-rib belt. The power steering-water pump belt is a 4-rib belt. Which pulley do you need?

 

[silky]

I need the Alt/AC pulley. Thanks for your help.