The Pre - 64 Model 70 is not the same bolt spacing as the Post - 64's. I talked to the people at PT&G and they told me theirs would not fit a Pre - 64, they are working on a new DBM that might fit but not sure when they will be out. I looked at CDI web site and their list is the same. They show Winchester Model 70's but don't specify the Pre - 64. I left a message with them to find out if theirs will fit, no return call yet. Thank You for your help.