I'm going through this EXACT thing after my suspension install. Bought this for my inner passenger rail exactly as it's pictured.
1996-2002 Toyota 4 Runner frame repair panel kit | eBay
My Indy mechanic is going to do that piece plus a 1-2 other small pieces. Then I'll be busting any surface rust off and going HAM with por15 metal prep and sealer
Thanks for the link, I am about to purchase and take to a shop. Was your shop happy with the quality of the repair kit?