Lead time for Bltiz I would say is minimum 3 months to about 6 months.
I've attached links for the two for technical details. I believe the IV SP is more race inspired..
https://www.hksusa.com/products/80230/AT023A/3539
https://www.hksusa.com/products/80250/AT003/3528
-Josh
We have experience with all of them except Wisefab since we don't build drift cars. Blitz is a great company but made to order products from Japan take a while. HKS is smooth. KW is an overall beast..
We have the KW ones in stock if interested.
Can also order up the Blitz, HKS one.
-Josh