I had a Safety Devices cage that I got from Stable Energies in my first car, and it was a great cage. It look 3 different rolls before I finally did it in, and that was only because we hit a huge tree. The cage itself was fixable, but the rest of the shell was pretty much beyond hope. So that's the good part... the thing that concerns me about your situation is that your car is no longer homologated. Ergo, the cage is no longer homologated under FIA rules if it was homologated by the FIA. However, it's much more likely that it was homologated by the RAC/MSA, which is the FIA ASN in the UK, just like the ACCUS in the US. I would ask Stable Energies if they can get you a copy of the front page of the homologation for so you can see who homologated it. The reason for that is this (from the NASA rulebook):
An FIA approved roll cage (with either FIA homologation certificates or ASN homologation certificates). The homologation of any such rollcage must be current with the date of logbook issue. [emphasis added].
This is much clearer than the RA wording, which just says: 1. Safety cages homologated by the FIA or a recognized ASN.
The RA rule could be interpreted in one of two ways. The first is that the cage has to be homologated as of the day of the rally that you entering (the strictest interpretation), or that if it was ever homologated, it's OK. The official interpretation is probably somewhere in between, and along the lines of the written NASA rule, but I would contact both sanctioning bodies and ask (and not just for this year, but for the foreseeable future). Even if you only want to run in one sanctioning bodies events (a bad idea in my personal opinion), you might want to sell the car someday, so you should build for both. Assuming that the cage was homologated by the RAC/MSA, then you'll need to find out if it's still current and when (if ever) it will expire, which they should be able to tell you if you give them a call.
The bad thing about Safety Devices cages is that they are not inexpensive, so if you buy a homologated cage (which will probably have CDS or T45 tubing in it that has a slightly thinner wall than would be required in a "cookbook" cage out of the RA or NASA rulebook), you could be stuck with a very expensive pile of scrap. The other thing to be aware of is that even though the ends are profiled, that's really just to give you an idea of what the final end should look like. The cage will probably require some hand fitting, just like any other cage.
One other thing to consider is that at one time you could specify the wall thickness that you wanted on the tubes, though I think that option went away when they started manufacturing the kits in Poland. If you want to do hill climbs or some other motorsports events with the car, you might want to consider that, because not all sanctioning bodies will accept an FIA homologation.
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John
