I am doing a brake job on a friend's 1992 Dakota LE 3.9L and hope I got the right size brakes when I ordered them online. I received the part #538 shoes which are supposed to be 9". I have not looked at the shoes or drums on his truck yet. When looking up info at a local auto parts, I saw there were 6", 9", and 10" listed. When entering auto info, I saw there were 3 different engine sizes for this truck listed with his being the size in the middle so hopefully I got it right. Anyone know offhand? This is a stock vehicle. Thanks.