We got our LED markers from
sales@race-mart.com in June, 2015 for only $5.25 each.
I popped off old lens, pulled old bulb, and plugged the new lens light-cover and all, in their place. There was no need to replace the mounted base, break seals, or have to re-caulk anything. It was really easy and at this price, really a good deal.
Our Flagstaff 8528IKWS took these matching lenses and replaced easily.
BAR-42-59-402 Bargman 42-59-402 Clearance/Side Marker Light LED For 59 Series Amber w/White Base and
BAR-42-59-401 Bargman 42-59-401 Clearance/Side Marker Light LED For 59 Series Red w/White Base