Bourns 3299P-1-101 Resistor Trimmer Potentiometer, 10% Tolerance, 1/2 Watt, 25 Turn, 2.29 mm Pin Through Hole Tube, 100 Ohm, 11.55 mm W x 6.1 mm H x 9.53 mm L (Pack of 5) - 3299P-1-101 - Walmart.com
Bourns 3296W-1-503LF. Resistor Trimmer Potentiometer, 10% Tolerance, 1/2 Watt, 25 Turn, 2.19 mm Pin Through Hole Tube, 50k Ohm, 4.83 mm W x 11.55 mm H x 9.53 mm L (Pack of 4): Amazon.com: Industrial & Scientific