Don't use WD40, use grease vastly better, sometimes the top mount metal gets pulled in a bit if the previous shock eye was just slightly shorter, I know they shouldn't be, I just put bottom on then jack up arm so it gets pushed into the hole, quick wiggle with s driver to align it, whack the bolt in, sometimes need to bash some metal bodywork under arch as a bit near on some and they scrape, just use a ball ended hammer on the body inner arch and the other hammer to hit the ball ended one.
tabetha