I think there is a bumper with stub rails or pins. I don't know who's
Shape wood into a concrete stop (search) and use 3 nails thru wood as pins. The ones that fit tight, chuck in a drill and sand for a minute, watch heat, It'll go. The length will increase the upright strength & stability from tube flex off the tie.
Stipple black under a med grey drybrush like your brushing off fresh concrete. "cept you brush it on. Highlight w/light grey drybrush.
Or stain / finish the wood, paint to match trim, furniture, etc.