Doors not closing without a serious push.

Replaced the refrigerator and removed doors to put the old unit in the basement as an overflow fridge. Noticed the cams broken/worn/missing on bottom door hinges. Ordered parts. When parts arrived, installed them and fridge back in operation. Parts kit had screws with slightly different sized heads, and if you used the wrong ones to mount the cams, there would be a clearance problem. There were no instructions with the parts to explain this. There also were a couple of plastic parts in the kit that were not used - no explanation given.