Just finished up installed some reverse lights on an 03 disco. I’ve got the safari gard bumpers which eliminate the bumper mounted reverse and fog lights. I got these on amazon for a little over $20. I’ve been running them on my Pickup for over 2 years without issue. The space is tight but they will fit the disco. Here’s some pics

This looks awesome! I want to do something like this as well since I have a similar rear bumper with out the factory reverse lights