Hi,
I'm also thinking of retrofitting door steps.
I'm tempted by these ones, since they look very similar to original front ones and almost OEM ones:
Smarter Shopping, Better Living! Aliexpress.com
fr.aliexpress.com
Only thing is they're battery powered. I was asking myself how they could be plugged on the front ones to get rid of the battery constraint.
Would you mind sharing where you bought yours and how you plugged them, to have them illuminated simultaneously with front ones?
Thanks in advance.