no problems. your question time matched well with my drinking time
actually I don't have much more to add....I think maybe some of the brands have same size end to end because some times it is a absolute pain to get the inner end in, other times it's not. lots of bashing involved.
when they are tight, bash the arm in with a hammer until one end is close. then work with something thin (eg big screwdriver) up to something medium (eg 3/8 drive extension), up to the bolt to get the inner end located. bolt on loosely. then outer end, always seems to be easier. not much help really, just confirming some brands are really tight.