They're both about the same price, 4$ for one on ebay for the first one, the other is 3.88$. I will check if the first one would fit my jack. I have thought of trying to cut a slot in a hockey puck too! That's a good idea to have 2 jacks and do one side at the time. I found that the OEM jack doesn't damage the metal under the car but it's more more of a hassle to use cuz you have to turn it to jack the car, that's why I'D prefer a way to use my regular jack without bending the metal (which happened a little the first time I used it).

I'll keep you posted, I'll most likely order one before spring! Thanks for your precious tips!