Where to find gas replacement starter?

Wondering if anyone can help us out...our gas starter for our wood burning fire place needs replacing. (See photo)

We are concerned that it will be difficult to disconnect the starter from the gas pipe so would prefer to replace just the top, but we are having trouble finding someone in Charlotte NC area or online that sells this starter, parts for it, or similar. Does anyone know of one or an online merchant that we could try?

Alternatively, what is the best way to remove the old starter from the pipe?

Thanks!