What a heck is a pulse whipper? i never heard of that!
How does it differ from a regular whipper?
Are you just changing the blade, or actual whipper ARMS?
If ur gonna change the whipper BLADE, u can simply go to autozone or walmart to buy NEW whiper blades, I would NOT get them off a junk car because the rubber gets damaged over time, that will be money wasted. There are realy good whipers avalible, i cannot afford em but i hear they are quite good, there are RAIN-X ones, look kinda cool too. 27$ each or so, last time i saw.
If you are gonna change the whole arms u need to get the arm and the little screw, first id check that the whiper arm will fit instead of ur old one onto the bolt.
You might be talking about whipers that both come out of the middle and then one goes ONE way and one goes another way? for that kind of MOD, u need to get the whole system off the junk car, u will need whiper arms, and whatever makes em move, i think its a set of gears below the whipers, or a few levers. you might be able to reuse your motor but it might have a different gearbox.
Goodluck