If your aftermarket tubular K-member is designed for a 4.6L engine, these will still work for your application. 

When using stock replacement rubber mounts, our adjustable mounts clear using Autozone Duralast 3001 & 3002.

Speed Engineering Headers 25-1028

Install

https://www.youtube.com/watch?v=b7D0j0E8C_Y

At the drag strip

https://www.youtube.com/watch?v=J5IouwQEIag&feature=youtu.be