Need to modify/gut the stock proportional valve to remove the the proportional effect from the block. Don't want to replumb the brake lines at this point. From what I understand I would need a ford part/plug to use here. What is the thread size of this plug? Description on Summits site says 1/8" pipe plug. Can a regular pipe plug be used? Really don't want to pay 8 bucks for something I may already have.