I have used both lighting type and motor run. The lighting type look identical to motor runs except mine had a resistor mounted between the terminals. Its important when buying that type of cap that the manufacturer puts it on the outside. If the resistor is on the inside it is no good for audio.
This place has Aerovox oil caps cheap. I bought some from here. Limited cap values here but good prices
Oil HID Lighting Capacitors | 1000Bulbs.com
I have used the Genteq brand of motor run caps with success. There is a company on ebay, out of Texas, that sells them for 8 bucks each. They have almost every size. They will combine shipping on multiple caps.
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