Attaboy beat me to it. here's what I had for you. R/T insert is made of pot metal (both top and bottom)with a drain hose off the right front corner. Be ready to pay $600.00-$1000.00 they are going for outrageous sums of cash these days. I suppose you could say they're made of unobtainium.

and the Super Bee insert is made of fiberglass (one piece) no drains. a little easier to find and usually a couple of hundred to $500.00 depending on condition.