Original GT patern upright replacements needed.

Can someone pls advise where best to obtain new old pattern cast uprights. My car has original period cast magnisum but I don't think they will be acceptable to FIA or DVLA due to their age. this is a shame because they are in very good nik. Their replacement must meet race & road requirements so I'm not quite sure if this is technicaly possible. Can I use mag components for road use even?
Worth NDT testing the ones you have as the cost of replacement is very high. At least then you will know if you have some new wall art or not.
Thanks guys, my uprights have been tested and are OK but not suitable for the track or for road use due to their age. Ill get and speak with Gelscoe but I had wondered if someone other than this company did castings.