Shackle bushings help!!

[Leeexplorer]

Hay guys I need help on where to buy new bushings for the leaf spring shackles on my 1999 4WD explorer. I am putting home made lifting shackles on and I'm thinking it would be a good idea to replace the bushings in the rear of the leaf on in the chassis to.

 

[Campoli]

I have a set of the shackle for the frame if youre interested in buying them I paid $67 ill sell for $50