Rear Bumper options

[Duro5341]

Hey guys

I am looking to purchase a class IV trailer hitch....
I have a 1986 K10 LWB

Now I called the local jobber, and he asked a few questions
He asked if I have a step bumper, and I replied yes......the stock one

Now he ordered me a Putnam #25000
Now it says it works on all 79-87 chevy/GMC trucks
(except short box, and 10" step bumper)

Now I have the original painted step rear bumper, is this a 10" step bumper?

Does a 10" step bumper differ from the orignial, plain jain painted bumper

Anyone got some pics, of the stock rear bumper options?

Thanks
Duro