Hello,
There should be contact information for the manufacturer on the box somewhere but here is the link to Dimensions Contact Us Page on their website:
https://www.simplicity.com/contactus/?topic=OTHER
In order to get any replacements for kits or to get something that was missing from a kit, you have to go through the manufacturer. Just contact them and let them know what you have and what you are needing and they will take care of it for you :) Thanks!
~Kristi @ ELH