You searched for "universal rectangular"
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Heatsink, Universal Square Ceramic, 5.1 °C/W @ 400 lfm, 9.4 °C/W @ 100 lfm, 42 x 42 x 12mm, Adhesive, Screw
Part: SF-CHS-424212-PC
Ceramic square heatsink with adhesive and screw mounting for universal IC cooling.
Legrand
Legrand Brass Rectangular Bar, 6.5mm W, 12mm H, 416mm L
Part: 0 373 00
Brass rectangular bar for electrical busbars and switchboard applications.
Malico
Heatsink, Clip, 42.5 x 42.5 x 12mm, Clip
Part: MBH42.5002-12P/2.6
Square clip-mounted heatsink for universal compact electronic component cooling.
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Heatsink, Universal Square Ceramic, 2.4 °C/W @ 400 lfm, 4.3 °C/W @ 100 lfm, 70 x 70 x 12mm, Adhesive, Screw
Part: SF-CHS-707012F
Ceramic heatsink with adhesive or screw mounting for IC cooling.
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Heatsink, Universal Square Ceramic, 3.7 °C/W @ 400 lfm, 7.2 °C/W @ 100 lfm, 50 x 50 x 12mm, Adhesive, Screw
Part: SF-CHS-505012-PC
Medium white ceramic square heatsink for chips, LEDs and power modules.
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Heatsink, Universal Square Ceramic, 5.3 °C/W @ 400 lfm, 9.9 °C/W @ 100 lfm, 45 x 45 x 12mm, Adhesive, Screw
Part: SF-CHS-454512-PC
White ceramic pin-fin heatsink for LED and chipset cooling with excellent thermal performance.