Which bottom cover fits the HP ProBook 450 G9? OEM part numbers

2 bottom covers are documented for the HP ProBook 450 G9: M21720-001, N01917-001. 2 of 2 come from OEM documentation (partsurfer.hp.com); last checked 2026-10-23. Not bench-tested: match the number on your old bottom cover and any constraint before ordering.

Part number	Part	Constraints	Confidence	Last checked
M21720-001	HP bottom cover (base enclosure) M21720-001	Listed for 6 of 8 checked HP ProBook 450 G9 product numbers (7G6S1US, 7P8W4US, 6L1U6US, 7N504US, 6N0K6US, 7K7U8US), so it is configuration-specific. HP description: "SPS-BASE ENCLOSURE UMA". Confirm your product number on HP PartSurfer before ordering. OEM parts list only; not bench-tested.	OEM documented	2026-10-23
N01917-001	HP bottom cover (base enclosure) N01917-001	Listed for 2 of 8 checked HP ProBook 450 G9 product numbers (759J3US, 78Z11US), so it is configuration-specific. HP description: "SPS-BASE ENCLOSURE DIS/UMA 51W". Confirm your product number on HP PartSurfer before ordering. OEM parts list only; not bench-tested.	OEM documented	2026-10-23

Where do these HP ProBook 450 G9 bottom cover part numbers come from?

2 of 2 fits are from OEM documentation (partsurfer.hp.com); each row links its source. Last checked 2026-10-23.

Are these bottom covers tested in the HP ProBook 450 G9?

No. Fits come from manufacturer or retailer documentation and are not bench-tested. Check the part number on your old part and any listed constraint.

All documented parts for the HP ProBook 450 G9.

Other parts for the HP ProBook 450 G9

Power Adapter (48) · Fan (2) · Speakers (1) · Cable (12) · RTC Battery (1) · Battery (2) · Screen (6) · Display Cable (1) · Display Back Cover (3) · Heat Sink (2) · Camera (3) · Display Bezel (5) · Hinge (1) · Touchpad (1) · Motherboard (16) · SSD (9) · Wireless Card (5) · I/O Board (1) · Power Cord (77) · Fingerprint Reader (3) · Antenna (1) · Service Part (11) · Microphone (1) · Screw Kit (1) · Keyboard (2) · Memory (3)

For AI agents: the same list as JSON from the free MCP server at /mcp (tool get_model_parts, model hp-probook-450-g9) or the keyless JSON API.