Does anybody know of and where I can find a good creature softbait that looks like a centipede maybe, and at least 3" to 5 " in size, for freshwater, Large Mouth Bass fishing in Arizona

Case Plastics sells a 3 1/4 inch hellgrammite. $2.49 for a pack. 

Lunker City lures has what you want. 

Lunkercity.com

 

A company called Nikko makes some also.  They are more like the material Zman is made out of.

I use the FYAO Devil Bug. I used the green pumpkin color on a ned rig jig head. 

Zoom makes one.  It was, for a short time, an alternative to a lizard for a carolina rig.  I have not seen them in years but they do work well. 

Lunker City makes a good one

You might try the Zoom Centipede baits. They have saved many fishing trips for me.

This post has me looking around at hellgrammite lures I have perhaps half a dozen brands and am most satisfied with the devil bug I mentioned above but I just saw the tackle HD hellgramite on TW, and it looks to be a winner to me... I want to try it asap

Tackle HD has a 5” Hellgrammite.  It looks more like a centipede than the smaller ones.  It definitely works as I have caught fish on it, but it’s only downside is that it’s not very durable.  

On 12/29/2019 at 9:28 AM, FishinBuck07 said:

A company called Nikko makes some also.  They are more like the material Zman is made out of.

I purchased Nikko hellgrammites on Amazon. I have not had a chance to use the Nikko's yet but they look good.

Here is what I bought.

 

https://www.amazon.com/dp/B076DG183M/?coliid=I1CND0XB880TYI&colid=W5JBCQ4M82V&psc=1&ref_=lv_ov_lig_dp_it