Received my 100lb heavy hitch last week. I set the three weights I have on it and I cannot get the rods to insert through the weights and secure them to the bracket. I know the website said some weights will need enlarged holes to work. Is there a list of weight #'s that work or a model number that works without modification? I hope to continue picking them up locally used and would like to buy the right versions.

FYI I have the R58822 weights.