Search fo unusual Items?

Have any of you ever had any success finding the following made from inconel:

cotter pins, 3/16" Diameter, head diameter .380" x 2" long similar to ANSI/ASME B18.8.1

Grommets with an inside diameter between .204 and .300.

These items are needed for use in a high temp enviornment up to (1200˚ F).

AND

Two lug nutplates similar to NASM21060 except with a titanium barrel and /or base.

I searched Thomas.net for quotes and came up empy.

I was hoping to find them as a stock item rather than having them custom made.

Any sources for custom made?

Thanks for positive feedback.