Without more info it may be difficult to obtain such as a model number. Perhaps a call to Jayco would be helpful in finding a source, they may even ship one to you. BTW welcome to the forum! Moved to General RV for more possible views.
2004 Chevy 2500HD Crew Cab 6.0l, 4.10r
2010 Jayco Jayflight 28BHS
Reese Strait Line with Dual Cam
P3 Brk controller