Need help finding part number, O-scale caboose

One of my friends in Mobile (a “lonely” O-scaler in this neck of the woods) is building an O-scale caboose using plans from a recent Model Railroader, but has misplaced the magazine. He needs to find the part number (and manufacturer) for the steps used on the caboose. Does anyone remember this article? If you can find it, we would appreciate your posting the information here.

Scratchbuild a caboose from styrene
Scribed siding on a modified underbody re-creates a Copper Range car
by Tom Houle
from Model Railroader May 2014 p. 52

And if the article posted above is the one you want, the steps are from Keil-Line, 48135.

EDIT: Figure 2 in the article says that the steps are 48-135. However, the material list says they are 48-315.

Thank you both! I phoned my friend with the issue details and the part number, and he’s mighty appreciative!

Gave him both numbers so he will make sure he gets the correct part.