I bought this for my 1937 with knee action suspension.  Part number on box is 609938 which is the correct Chevy number for my car but it did not fit.  Number embossed in shaft is K3-30457.  Number stamped on roller is 56.  Dimensions are as follows and maybe someone can ID it.  Large diameter of roller: 1.60”.  Roller groove diameter: 1.17”.  Length of shaft including spline: 4 15/16”.  Shaft diameter: 1.125”.  Length of threaded end of shaft: 7/8”.  Outside diameter of threads:  .75”.  Contact me with questions.

Thanks, Bob