Can the 8K knob be installed on a 9K chassis? March 02, 2016 17:00 Answer No, the two are not compatible. Applies To 9K, 8K Additional Information Related articles What lubricant can I use for the Key Combinator? 45H & 47H Mortise Locks How to Order: 45H Series Mortise Locks with Visual Indicator 9K Grade 1 Cylindrical Locks What is the part number for the Padlock Throw members?