Motive ships the 1107 with an extra o-ring but doesn't bother to tell you what the extra o-ring is for. Obviously the inside diameter of the brake reservoir on some Ford necks is variable. The Motive comes with a "thick" o-ring which I think will fit some tanks. The replacement O-ring is made of thinner rubber. This is for tanks with narrower necks. Like the expansion tank on my Mustang. But Motive didn't send any documents. You have to go to their website and read the FAQ page to find out that you should swap out the thick o-ring for the thin o-ring. When I emailed them to tell them how brain dead it was to send 1107 without this documentation, their auto reply said my email was deleted unread. The subject is incredibly rude. The lid fits easily with the correct O-ring. That's the only positive thing I can say about him. You are lucky that I give this product 3 stars.
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