^^^ What Chris said, especially trying to use Red and Amber LED's in lamps with Red and Amber lenses meant for Clear incandescent bulbs.
I was very glad to replace the triple Bargman RV Stop/Turn/Tail/Backup Incandescent lamps on the rear of our Class C with complete Bargman LED lamps. Yes, I had to wire them instead of plugging conversion kits into the already-troublesome sockets in my old lamps.
Also, in the Coast Guard side of my life, we see people wanting to convert their Red and Green running lights to LED using "bulbs." This de-certifies the "USCG Approval" because the light comes out differently on the spectrum.
Back to Amazon:
This is 05 Red and 05 Amber for $37. They're called "2x4 inch" with "standard 3 inch mounting." I measured ours and that's what we have. Five Amber across Front, Five Red across Rear, One Red One Amber each side. The "partsam" outfit has them in Four Packs too so I could replace all 14 in the $50 range which looks like an economical way to upgrade. I wish they were totally sealed, lens not removable, and screws went through pockets in the lenses. That keeps dirt buildup out. And if I were to be hanged I guess I'd request a new rope...
Far as PartsAm goes, I bought a pair of Sealed Oval Stop/Tail/Turn lamps from them. They seemed pretty solid, and both worked coming out of their plain white "made in China" boxes. Probably not enough data to do a "review" but Amazon came through as Amazon does, product working, undamaged, and invoiced correctly. You might be interested in this project. Stop/Turn connected to the toad's brake light and bungeed to the windshield side of the rearview mirror. So I can see when Brake Buddy applied the toad's brakes and more importantly that he fully released them. I'd like to power the Tail/Running side to be able to see the Toad was still there in the dark...
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB