Post a photo if you end up getting the one on ebay. I bought a used zenki license plate garnish assembly but its sitting in Japan waiting for ocean freight container prices come back down... which may be never.
Its hard to tell from the photos on ebay if it as an actual trim replacement with clips (like oem/carmaka) or just an overlay that sticks onto the oem license plate garnish.
https://carmarka.com/en/toyota-land-cruiser-prado-150-2018-rear-trunk-door-chrome-moulding-cm-fj15018trdrchml
PT228-60140 does not cross reference in the Toyota Parts catalog. It appears to be a Lexus dealership only part unless this is masquerading with a different Toyota specific part number.
How did you modify the Prado rocker panels to work with the 4runner rock rails? I have Prado rocker panels on their way from Japan and am considering this combination as well.