Plastic body lift pucks cut to length work a little better than hockey pucks. 3" diameter for the front axle pad and 2" diameter for the rear cup.Yes, it’s due to a different bend than stock. I know front bars won’t clear where the stock bars will. I’m a little unsure on the rears, but I believe it would be worth the research. I’d hate to install something to find out it has clearance issues.
Hockey pucks for front seem to be the norm, but I thought cup extensions we standard for rear. No reason I can think of that a puck won’t work there too.
On taller lifts where more extension is needed, it is best to split the difference between the cup and the pad so that the bumps line up better and to reduce leverage. Currie does it this way.
All of this is why cycling the axles without springs is so important.