Your search query on "HP / AGILENT / KEYSIGHT Other Test Equipment Parts & Accessories" returned the following results:

Agilent / Keysight 33220-88304 Rear Panel fits 34410A, 33220A, 34461A and other (325347577496)

Agilent / Keysight Rear Panel fits 34410A, 33220A, 34461A 34465A 34470A other (146020487617)

Agilent / Keysight Rear Panel fits 34410A 34461A 34465A 34470A 53148A other (186599144494)

HP / Agilent PSU Knob fits E3640A, E3642A, E3643A, E3644A, E3647A & other (325729030790)