I certainly did measure the total height of the original incandescent bulb (~24mm) and stayed away from any where the description had them larger than that. The ones I ordered look like the LED is a T3 (10mm) package and if so, should work.
I found some
that would definitely be really short but were a lot more expensive (I have 13 of them to do), however I'll try that if the ones I ordered are too dim. Since these are only on in the dark and any light output is probably going to accomplish the 'side marker' function, I'm not really worried about the brightness unless they are really dim.
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam