Are radio interfaces necessary on an 03 suburban?

[Etp23]

I recently purchased an 03 suburban and it came with am aftermarket stereo. The battery was loose on the vehicle and I think it shorted out the interface that was installed. (Or that's what the people at the audio place told me). Before I took it in to the audio place I tried wiring the radio directly to the battery and it wouldn't turn on. So I'm guessing the people from the audio shop were right. They tried to charge me 250 dollars for an interface but when I look for one online I see some that are a whole lot cheaper. Do I need to go with the 250 dollar one for my truck or can I use a cheaper one ? Or better yet just bypass the whole thing?

I know it's all a bit confusing but I appreciate any help. I'm not the greatest with radios.

 

[zora]

Please provide a link to what you are calling a radio interface.

 

[Etp23]

Please provide a link to what you are calling a radio interface.

Oh man sorry I didn't realize anybody responded. This is the part that I'm talking about I guess it's to retain some steering wheel controls and what not.

Metra GMOS-04 Wiring Interface

Connect a new car stereo and retain OnStar®, the audible safety warnings and chimes, and the Bose® audio system in select GM vehicles

www.crutchfield.com

 

[zora]

Going to crutchfield.com was the correct place to go for a new one.

 

[Etp23]

Going to crutchfield.com was the correct place to go for a new one.

Yeah I haven't put the order in yet. I went to an audio shop and had a guy check it out he was able to wire the radio to the ignition but I'm trying to avoid paying the 500 ish dollars they're trying to charge me I'm just horrible with wiring. I might give this a go tho. Appreciate your response!