This new style 1 or 20 Meg resistor
  was chosen to replace the old  
  style carbon film resistor. The  
  new style resistor is wire wound  
  65 watts, and has a tolerance of
  10%. This resistor is physically  
  smaller that the old carbon film.  
  To install this resistor use the  
  top mounting hole for the top  
  standoff; a 1/4 inch hole will  
  have to be drilled through the  
  lower panel to mount the bottom  
  Lower standoff  
  Old 1 Meg resistor. This resistor was carbon film, 30 watts, and
had a tolerance of 10%. The length of the resistor was about 12
inches, and the diameter was about 1 inch.  
ELECTRICAL BOX Upper standoff
  The set of six blue resistors was used to replace the 1 Meg or 20 Meg
while the standard resistor was unavailable from the OEM. The blue
resistor, when used for replacing the 20 Meg resistor were series paralleled
13 Meg ohms; when used for replacing the 1 meg were series paralleled 1
Meg ohm.