I've tried two ...
I've purchased two magnetic plugs, but neither one fit. I would get the plug threaded about one and a half turns and then - it stops dead. I know I could force it, but I'm just not willing to do that. It should thread in all the way, smoothly. The stock one does.
Let me say that the folks at Geno's Garage have got to be at the top of the customer service charts! These folks are great. I returned the first one and they asked if I'd like to try a second. Now that this has proven to be the same as the first, I'm going to stick with the stock plug, at least for now.