There are many resources to obtain information regarding car seats. If you like utilizing the internet for information, the following websites may be of use for you.
National Highway Traffic Safety Administration
There are inspection stations across Colorado to assist you with fitting your car seat.
You may also find your local fire department can assist with an inspection. You can call them and ask for a certified car seat inspector.
South Metro Fire 720-989-2000
Englewood Fire Department 303-761-7410