It hurts to see discount on items I bought.
The caps are nice, but it not having tight-fitting problem is incorrect, at least in my case.
I had to shave off significant amount of aluminum on one of the two keys for it to fit. For me, it was blue blank that had the problem. The red blank was relatively fine, but it was also tight-fitting. I didn't have to shave off metal in order for the red one to fit, but it needed some bending using a screwdriver in order for the cap to go in all the way.
Luckily it was fixable, but out of two aluminum keys I bought, two of them had tight-fitting problem: one was very severe to the point where I had to shave off aluminum using an Acto knife.