Hey all, There is some massive confusion (for me...) around wheel cylinders for my car. Seems like there is different information around. And before anyone jumps on me, I rebuilt these once, and are leaking again after 2 years. Not sure how many times before me they were rebuilt, so I just want new ones to be safe for peace of mind. According to AC Delco's site, part #18E743 and 18E744 are for front drum brakes, and the 1952 Oldsmobile is listed as a fit (see attached). Unfortunately, it gives no information on for bore size. When you click "product information" it just blows up the picture real big. When I went to Rock Auto to overnight these (NAPA doesn't have in stock, and our car club has a big show on Friday/Saturday...) it says the bore size is 15/16", which is the rear. The fronts ( I believe) are supposed to be 1 3/32". Can anyone out there confirm? Will it greatly compromise braking safety to go down that size?