Need wire advice

[Matoo]

Hi, new here and new to mig welding.
I am working on replacing some body panels on my project car and I'm not sure what wire I need to use.
I use a Handler 135 and I'm picking up a tank of argon mix gas. What wire would be best for such an application?

Thanks

[myplace46]

.023 is probably what you need, you can get it pretty cheap at harbor freight, 10pound spool for $14

[MigManiac]

.025 solid wire ER70s 6 i think is the aws #

[Matoo]

Thanks.
Here is a pic of the car in it's current state. Plan to replace the rocker panel this week, then moving on to stiffening it up and designing a roll cage.