The alternator type you have selected is the 21/22SI J-180 (4" mount) design
Please review the alternators presented below and then select the proper application for your vehicle's engine.
In order to make the exact choice, please be sure to answer the following questions about your application:
Important note : Delco type 21SI and 22SI alternators are exact in almost every way. Each may be used as a substitute application for the other with no loss of performance whatsoever.
IMPORTANT NOTE...Delco type brushless alternators should be considered as upgrades to the standard 22SI type, 110-555 type or Leece-Neville type alternators operating in high dust/dirt construction environments. Because brushless alternators contain fewer moving parts their service life cycle is substantially longer than standard brushed alternators. Click here to review our Delco style brushless alternators. Be sure to carefully review all measurements when upgrading from brushed to brushless type alternators.
Match the details from your alternator with those noted below (such as system voltage, amp output and etc.), determine the correct alternator from our selection and click on the part number for exact unit picture and data.