I posted this in the mechanical forum, but got no response. Is there anyone that knows about these shackles? Or 2000 and up shackles in general?

I recently ordered a set of McGaughy's lowering shackles like someone on here suggested. They came in today and the invoice says "88-98 chevy truck, 2wd, 1/2 ton." They are supposed to be for my '04 truck. Are they one in the same? Will they work on these year models as well as mine? Thanks in advance!