Good question, this unit comes with everything but the awning rail extrusion.
**Solera Awning Rail Extrusion - Black - 8' Long # LC715217.
*Replacement 13' Wide Roller w/ Fabric for Solera RV Awnings - 8' Projection - Black Fade # LCV000211459.
Replacement Endcap for Solera Power Awnings - Black - Qty 1 # LC423750.
The endcaps for the arms are heavy duty metal and do come with the unit. I will link a replacement part and a video of it so you can see. view full answer...