As of 2024-01-09 Journeys Off Road is the only manufacturer off road specific Astro/Safari bumpers.
Ali Arc Industries appears to have made a small run of aluminum bumpers, perhaps for rail road shuttle vans.
Astro/Safari vans are roughly the same width (77.5") as GM's 1986-2000 C/K 4th generation trucks (77.1") and have similar grille/bumper junction lines. It should be possible to use the aftermarket bumpers for these trucks with some modifications to the mounting points.