There are many. The ones I dealt with were LSM, Bullet and Comp Cams. These are all custom so I doubt you would see much in any listing or catalog other than something mentioning that they provide them and to contact the factory for help. Last time I ordered a new one was ~15 years ago and it was just under $700 so with what has happened with prices over the last few years it wouldn't surprise me if the cost was close to $1000 possibly higher. Maybe I'm wrong, hope I'm wrong for your sake.
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