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Perfect if doing for a two foot fixture. Should ad a part number with 36" leads for a 4 ft. fixture. I had replace the wires in the tombstones for each of my upgrades. I would have paid a bit more that speed up my conversion.
I bought these to replace a retail store with the LED T8s. The LEDs didn't come with any lamp holder for re-wiring so I have to buy these. The plastic is on the cheap end but should hold as I likely won't touch them after installation. The biggest complaint is the length of the wires. I have the 2 X 4 lamp fixture with 3 lights. The 10 inch wire won't reach both ends of the slots after connection. This means I have to extend 1 out of 3 holders for every fixture. It is annoying if you have 30-40 of fixtures to swap out.