Same issue here, one 4-pin socket was a perfect fit, the other is way too large.
Also, one 9-pin socket was too large for the hole & the same for one of the 9-pin sockets on my Reduction.
I'm reluctant to file out the hole as it then gets quite close to the mounting screw hole.
I have a bunch of 9-pin sockets from ebay, so just found ones that would fit. So, just ordered some of the 4-pin sockets as well, they're cheap enough at about $2 each.