I believe they still sell gasket material. Wouldn't be hard to make your own gasket.
I find two axle flange gasket numbers on Napa's site.
Fel-Pro FPG 55350 - a circular gasket with 8 holes (looks like a full-floating axle flange gasket for a heavier truck)
Fel-Pro FPG 4978 - a squareish gasket with 4 holes (Likely for the axle housing to brake backing plate.)
Last edited by klhansen; 04/21/2020 1:47 AM.