Machined from 6061 T6 Billet these doorstops should provide years of trouble free service. I also hear you can use them to lift Delica's... to each their own I guess!
Still working on price, the kit will include U bolts.
I heard stories of cast aluminum blocks cracking (although I don't know how much of that is rumor or not). But most billet ones I found were either 6000 or 7000 series aluminum. 7075 seems a bit ridiculous imo.