$1,234 · Wanted "side mounted oarlock sockets"

While my oarlocks are 1/2", I have purchased a couple of sets of 1/2" sockets but both are too tight, not sure why. Side mounted sockets are hard to find it seems so if you have any for sale, please let me know. My oarlocks are old, heavy iron and well made (and well loved) , perhaps older North American made sockets would fit better than "Made in China". Thank you, email or 778-430-8060 (no text).