I am not 100% sure, but those BMX brakes should work perfecly on a BMX.

Note that the Amazon ad seems to be for one brake (front or rear) but it is not clear how you select which end of the bike you get brakes for... and generally you need a much longer mounting bolt for front brakes.

The ad also gives a 'reach' of 69 to 97 mm - if the centre of the rim is between 69 and 97 mm vertically fromt eh brake mounting hole then these shoudl work... except for the front/rear mounting which I cannot explain.

I know that at Canadian Tire in Canada you can buy a set of bmx brakes for cheap... maybe check out some of the bike shops and box stores in your area and see what is availalbe.