Hey there, my master cylinder gave up the ghost a little while back, and have just replace all the rear cylinders, hard lines and have put on a new master from Napa... But the model they sent me is clearly meant for discs all around... The proportioning valve from the previous master won't fit in the new master due to a different size port the brake line adapter screws into... I'm wondering if anyone has had a similar problem and found some success with an in line type adjustable proportioning valve? I'd rather not have to go out and get another master........