I have the old Mercedes (non-CD) shop manual which lists piston/piston bore options on page 03-10. I cannot find my pistons on the table listed on that page. My pistons are stamped 90.875 with a 1 in one place and 64 with an up arrow on another place. These pistons do not appear on the 03-10 Table which I have scanned and placed at www.jersey.net/~rtc/BENZ.html. I am about to order my rings, but I am confused. Was this engine possibly resleeved and repistoned with non Mercedes pistons.MY ENGINE NUMBER iS 616-011-28-01; 83 B21; 2.