I have an 87 Barth 31 ft motorhome built in a John Deere Oshkosh Chassis. I need a new brake master cylinder, but all the ones I have found have been modified with the Brake fill tank connection moved to the middle. The original has it on the Right side. It needs to be on the right, or it will interfere with the transmission linkage, which cannot be changed. Any ideas for where I can find a new old stock master cylinder, or a company that will rebuild the old one?