I guess I should understand this by now but I'm still not getting it. I would like to get three inside LED light bulbs to replace the three that burned out in the first few days of ownership (weird, huh?). When I look at pictures online, my Scamp 2017 light bulbs look like 921s but then there are two distinct different types of  921 LED replacements -- one has a flat-round type of head (like this: http://www.ebay.com/itm/Jtech-4x-T10-24-SMD-LED-Bulb-Super-Bright-Warm-W...) and the other ones that have a "tower" head (like this: http://www.ebay.com/itm/20x-Warm-White-T10-921-194-RV-Trailer-42-SMD-12V...). This "tower" type says it is an backup reverse light.

Here's my confusion. My inside light bulbs (that all burned out) and my outside light bulbs (for the two porch lights) look the same. And they look like this (https://www.amazon.com/dp/B00JS3TFN8/ref=asc_df_B00JS3TFN85188479/?tag=h...). So they seem to look more like the LED bulbs that are said to be for backup reverse lights.

So which do I buy? Tower or flat-round?

I have read all the info on our resources page and know about warm light but this is a "shape" question. Novice trying to get it!