Lock Spring Guide. Fits: Most Oliver 1550, 1555, 1600, 1650, 1655, 1750, 1755, 1800, 1855, 1900, 1950, 1950-T, 1955. M-M G750, G955. White 2-70, 2-85, 2-88, 2-105, 2-110. #106944A. These are OEM.  We are out of stock on our regular stock.  We will have them made as soon as we can.