Hi Rachael,
Welcome to the Heartland Owners Forum and to the family. We have a great bunch of folks here with lots of information and all willing to share their knowledge when needed.
If you have questions about anything in/on your unit, you can usually find the answer right here. We have a great search engine on the forum, both simple and advanced also. Sometimes that is the fastest way to find an answer instead of waiting on someone to reply. Although,,, I don't think I have seen the dimensions your looking for posted by anyone. Hopefully someone with the same unit will measure theirs for you.
Also be sure and check out our Heartland Owners Club. Join us at a rally when you can and meet lots of the great folks here and make friends for a lifetime.
Enjoy the forum and your new unit.
Jim M