For the life of me I cannot remember the brand, can't find it in emails, I'll see if I still have the package at home. I think the brand was a three letter abbreviation with a G in it that stood for German, IIRC....
But anyhow..... I swapped my bulbs out for LED's a while back. First set was cheap ones and they died quickly. Spent a little more on replacements with "German" (I think) in the name and they have lasted quite a while. No resistors added, they do flash faster but not enough to be an issue.
Oxford White 2013 F-150 STX SuperCab with 5.0: Airaid Jr. Hellwigs. Flowmaster Force II. SCT Tuner, MPT Tune. 5.0 & Coyote badges. Mustang Covers. 2"/3" drop. FX Wheels and lights. DD3.0. Clarion NX702. Rockford Fosgate 3Sixty.3. Alpine PDX-V9 running Alpine SPR-60C in front & Alpine SPR-68 in back. Kicker CompVT 10" in MTX Thunderform.