Spent $80 on a 'universal' EGR delete kit that didn't fit a single truck in the shop.

The listing swore it worked on Duramax, Powerstroke, and Cummins from 2001 to 2015. The hardware was cheap, the instructions were useless, and I wasted three hours trying to make it work on an '06 5.9L before giving up. Ended up ordering the proper, model-specific kit anyway. What's the most obvious scam part you've bought online?