what resistor? electricals, helps me out

[Dnyce]

so, im doing some custom light work, and i got a led sequential integrated taillight. only problem is the signals dont light up sequentially unless i use two resistors (see pic). problem with that is
1) the light only came with two resistors, and i would need four, two per side. 2) they get hot, and so i hear, burn out frequently.

solution-get one resistor that has a rating equal to the two resistors.
or something else you guys come up with...

id guess since i need two 20w 5ohm resistors per side, one 2.5ohm resistor would do the trick, but does the wattage stay the same?

ive read that a no load flasher slows down the led blinkers, but where is it wired? inline with each side? or its a replacement for the flasher relay in the harness somewhere?