How much money do you have?
If you want something done for under 1k$ (seeing that you do it yourself)... JDM B20a.
It's a direct drop-in for b21a1 Preludes, and I believe there's a small issue with the b20a5, mount-wise. It was easy for me to do though.
As far as the h22a goes, placeracing I believe makes the mount kits, either that or HAsport.
You're looking at 3k in exspenses.
If not more