1997 Ford F-150 Rail Cap

I drive an old truck. At the time of this post, it is a 23 year old truck. I do all of my maintenance and repairs myself. I take great pride in that. However, over the last 23 years, I have lost three of the four rail hole covers that are at the corners of the truck bed. I'll take them off to use my ratchet straps to tie something down and then put them back on again. I suppose that at some point, I left them in the bed of the truck before driving down the road. I assume that they are now lying along side some Texas highway. Sorry, Texas, I didn't do it on purpose. Then I realized that I have a 3D printer and that I can fix this problem. When I did a search, I found this thing by PurdueTech2010: https://www.thingiverse.com/thing:155554. It is a nice design. Better than anything I could make. But it is for model years 2000-2007. Mine is a 1997 and is slightly different. Fortunately, the size of the hole is identical. So, after resizing the tongues that hold it in place, it fits my truck perfectly. I would assume that this would also fit years 1998 and 1999, but I'm not sure. Ford changed the design of the truck slightly between 1997 and 1998.