Because of the many different housing configurations Please give vehicle year, make,model, engine, options, or OEM housing Number or alternator Number in the comments section of the order page.
Rear Housing (Slip Ring End Frame)
.....D1-CS144-171-140.......1989706............OEM Style Rear (S.R.E.) Housing.
Front Housing (Drive End Frame)
.....D1-CS144-181-140.........NA.....Front (D.E.) Housing W/unthreaded Tensioner hole
.....D1-CS130-141.................NA................Front (D.E.) Housing W/Threaded M10
.....D1-CS130-142.................NA................Front (D.E.) Housing W/ Threaded M8