Dell Latitude C840 Service Manual page 7

Palm Rest Bracket:
M2.5 x 20 mm (1 each)
M2.5 x 4 mm (4 each)
Fan: Memory Module/Modem Cover:
M2 x 4 mm (3 each) M2.5 x 20 mm (1 each)
Mini PCI Card:
M2.5 x 20 mm (1 each)
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Modem Daughter Card:
M2 x 3 mm (1 each)