Block Heater

Hello once again :)

I have a few questions regarding a block heater in my 2006 Chevy Aveo. I bought one from NAPA, and I'll post a picture of what I got. It is a Kat's 11405. My dad thought it was weird that it is threaded. We didn't want to break out the freeze plug if it was the wrong heater.

Attachment 10004

We called the dealership, and they gave us the actual block heater part number: 96410176. They said they had none in stock, and it would be a custom order with no-refund if it was the wrong one. They said the heater is $79.05 and $128.61 for the cord (I think I paid around $50 at NAPA for everything) The guy at the dealership said that another dealership a little bit away had one, so we called there and asked if what they had was threaded, and they said it was. They didn't have instructions for installation though.

We were wondering, will the heater that I bought from NAPA work in my Aveo? My dad also wanted to make sure we knew which port it goes in.

So what have other people done? How have they removed the plug, and are there threads in the block that the heater just screws in? Will removing the plug damage the threads? We just want to make sure we know everything before we try and install it.

Thanks!
Andrew K.