I have a GE Profile Gas Cooktop model #JGP641EM1WG and we purchased a Top Burner Igniter (part #WB13K5058) from Appliance Parts Pros and need a little help installing part. Can you advise? 
Disconnect the gas line from the cooktop and unplug the power cord. Remove all grates and knobs. Remove the cooktop from the counter and carefully turn it up side down. Remove all screws holding the bottom panel. Remove the clip holding the igniter. Be careful not to brake it because this part is no longer available.
Gene.