Those lift channels are available new (reproduction). I found an NOS one in Cali a couple of yrs ago and thought I should buy a spare but they only had one for left side. (J20).
I came across the repros later but don't remember who is making them.
I'll check my fav listings.
'82 J20, 360,TF727, NP 208, Holly Projection.'74 paint scheme
'67 Jeepster 8701,true convertible,TH400,pwr top,
'91 XJ, 4.0L,auto,Selectrac,Ramsey 8000,GC upcountry susp
'98 XJ, 4.0L,auto, Selectrac, police package