I have a intertherm model feh-017h electric

Question

i have a intertherm model feh-017h electric furnace and keeps blowing fuses or burn fuses. furnance keeps running , and tried thermostats. repair guy says he thinks its the sequencer.he says they don't make them any more.i saw a website that carried them 159.00.but don't know if they are the right ones.is this a steep price. both of them are on a metal panel. any help on this.