Remington changes their stock dimensions from time to time, so it could depend on how old the gun is.
About 5 or 10 years ago I ordered a pre-fit Pachmayr pad from Gamaliel for my '93 Express. They told me up front that Remington had changed the dimensions of the stock and that what I was ordering would be too large. It was, so I sanded it down. Parts of it had to come down 1/8th of an inch or more.
John