Hello, Linda -
Apparently the Sidney model convertible crib is made by ChildCraft.
First, you will need to know the model number of the crib. According to the information here:
On older units the 14-15 digit model # of your crib will be stamped on the bottom edge of one of the side rails or one of the ends. You will only use the first 5 digits to view this file.
On newer units the model # will be on a sticker on the inside of the headboard or footboard. Use the first 5 digits following the F. Do not use the F or the two digit color code.
You need to call ChildCraft Customer Service to find out if replacement hardware is available for your crib:
Mon - Fri, 8 am - 5 pm, Easter Time, excluding holidays
Note: If the crib was manufactured before 2011, it may not meet the latest safety regulations and/or be unsafe to use. A customer service representative will be able to advise you.