Anyone know where I can get these cut to custom lengths?

Go to radio shack, buy a crimping tool and some connectors and do it yourself.

Just make sure you get the polarity correct or you will fry the ECU.

Or call BobW he can make up whatever length you need. Be very careful if you do your own the polarity is critical!!

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Thanks for the tips. I forgot I have an extra GSU with a long cable that will work!