fuel cap threads

[99blackdually]

Ok well i had a slight accident with my filler neck on my truck, and the filler neck is ok I had to cut it to make it fit my application (flatbed). The problem is the threads in the filler neck were plastic and it melted them and need to know if anyone knows where to possibily get this part...or maybe even a flatbed filler neck would work...

any help would be appreciated..thanks