Quick question: the correct seal has dimensions 27x42x10x7 (mm), but many seals are simply described as 27x42x10 (ID, OD, width). What does the 7mm refer to? Is that the width of the inner part of the seal vs 10mm = width of the entire seal?
 just for context, I have installed a new seal on the inside, wanting to keep correct factory spec. for this build, and when apparently fully seated, the seal protrudes a little. Is this normal or should it be flush with the seat?