Early Style CAS OEM Part # 23731-45V10 Brand New, Discontinued Early Style for 1990-1993
This is a genuine Nissan OEM part, that has been discontinued for some time. It is NOT aftermarket, and has never been installed. These are nearly impossible to find in truly new condition.
The ones found on Ebay tend to be rebuilt parts that are merely cleaned up and labeled as new—the bearings are often weak and they usually don’t work very well for very long.
The shaft on a new CAS should have some resistance when turning it (not loose or freely turning) yet should be smooth, without any binding.