Very happy with the burner I purchased. Installed and have used. Works very well. Here are the parts:
571-36HC - High Capacity Flat Pan
FRS-24HCKIT - 24" Round High Capacity Burner Match Light
MAFB-HC - Black High Capacity Valve
SSC-HC24 - High Capacity Flex Line 24"
Burner attached to natural gas:

After making ring from mountain stone (lose fit, no mortar used):

Playing with large lava rock (not 100% happy yet):

My only complaint is there is a whistle when I open valve all the way. Must back down to about 50%, but still very high flame. Most likely due to using 1.25" gas line and the corrugated flex line.
Good luck!