I would like to put a canopy on my 2004 24' towlight. I have a new canopy from a regular canopy and would like to use it if possible. What do I need to do to modify? Also where can I purchase the arms?

Welcome to the forum. You should be able to buy the awning at any RV parts store or a complete awning. You'll need these brackets to attach the arms. I believe that most, if not all, of the the awnings were made by Dometic.

https://www.dometic.com/en-us/us

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"Ruben"
2404T, 2003 2500HD 4X4 GMC Sierra SLT Crew Cab w/Astro camper shell and 2003 Chevy Tahoe LE 4X2
Far West Texas

i think i have the brackets

If the material is to long or to wide you could take it to a shop that makes fabric awnings/boat covers. They would be able to re sew it for you. Might be cheaper to order the right fabric from the start. See back posts for companies that have been used. My 1990 awning is from Carefreee of Colorado.