Sky manufacturing is a really good way to go. Comes with everything you need, Although the grade 5 bolts it comes with are a little questionable. You will have to drop the fuel tank to access the inside of the frame rail To bolt them in, But if you think about it, when was the last time the tank was out? Most likely never, Good time to check it out, maybe clean out some 25 year old crud.
I know of some guys that went the cheap way and grabbed some shackles of a 3/4 ton chev from the scrap yard but thats alot of work in the mud/ or cold depending on where you live. I think the Sky shackles were 115.00 before taxes and shipping.