I got this kit from @
JDKane527 and it fits into the bracket perfectly.
It was hard to shift into the gears unless I put extra pressure after the clutch hits the stopper to depress the pedal even more. I had the clutch pedal lowered 3 months ago so that it was either the same height or slightly lower than the brake pedal (don't remember, since I did the adjustment last year as well). I'm not sure if this is the cause of the problem or not.
I ended up chopping off about a fifth to a quarter of the bumper and I'm able to shift into gear perfectly now. The shifter is going into all of the gears like before.
The rubber is nice and dense inside, so I don't think it'll wear out any faster than when it had the outer layer.
I'll have to get used to the shorter travel, though. Didn't give it enough gas a couple of times when shifting because I'm so used to letting off the clutch half an inch before giving it gas. Now that the bumper is there, I need to give it gas as soon as I let go.
It is a lot less tiring to shift now! Since I'm usually pressing the clutch all the way down, I don't need to extend my calf muscles as much anymore.