shaped Dell Power Supply is compatible with the following Dell Part / Model Numbers:

Dell Part Numbers:

U9087
NH429
MH596
P9550
F5114
X9072
N8374
NC912
MC638
KC672
M8803
K8965

Dell Model#:

L280P-01
D280P-00
H280P-00
AA24120L

This style of "L" shape or notched power supply is typically found inside:

Dell Dimension C521, 3100c
Optiplex Small Desktop Systems with Model# 210L, 320, 330 740, 755, 760, GX520, GX620, and new style of GX280.
Connectors:
1 x 24-Pin P1 ATX Power Cable
1 x 4-Pin P2 Power Cable
1 x FDD P4 Power Cable
2 x SATA P5 & P6 Power Cable