Most awnings on campers are made by either Carefree of Colorado or Dometic/A & E. There should be a tag that identifies the brand and model number. Once that is determined, you should be able to determine/obtain the part numbers for the poles you need. Once you have the part numbers, you should be able to get what you need from most any RV dealer or maybe even on-line sources such as Amazon.com.
FAA A&P mechanic, ex-RV dealer parts dept
Retired B-52 Gunner/Flight Examiner, B-52 Crew Chief
2016 Jayco Eagle HT 29.5 FBDS w/ 15,000 BTU AC, 50 amp service, upgraded counter top, thermal pane windows, elec. stab jacks, outside grill, backup camera and MORryde pin box.
2011 GMC 2500HD DURAMAX/ ALLISON