You don't need that exact part a 2pole 20 amp definite purpose contactor with a 120volt coil from just about any supplier will work. Do your self a favor and upgrade a little and get a 30 rated contact it will last longer. Looks like the coil is smoked from your pic. The coil is sold separately. Granger will be the most expensive route Johnstone will have it or an equal. Here is the link. https://www.johnstonesupply.com/stor...tore5/home.ep?
You sure an electrician is telling you this. Get rid of that guy.