Edit: SOLD
I have two VLED 921 bulbs for the reverse lights on a 5th Gen 4R. They work great, much brighter than the stock incandescent bulbs and a nice white color (5000K). I used them for about two months then got a different brand of LED bulb.
They are currently $35 each from VLEDS. I will sell them to you for half price, $35 for two bulbs. Shipping included. Payment via PayPal.
VLED website:
HIGH OUTPUT WHITE 6 LED 921 - 921 - Reverse Back-Up - Shop By Application