What are the 3/4 ton rear bumper options?

[davepl]

My '70 Sierra Grande Custom Camper (ie: 3/4 ton longhorn) has a rear step-style bumper. It's not diamond-plate, but some kind of traction surface. It's painted silver, however, and even though it wouldn't be original I'd like a chrome bumper.

It's not clear to me that the factory bumper would look that good chromed, for some reason. I'm wondering what my options are for a rear bumper... would a longhorn ever have a "regular" chrome rear bumper? Or was a chrome step bumper ever available?

If not, has anyone chromed an original step bumper, or are replacements available that look "period correct"?

Thanks!
Dave