EK1, if you want a halo seat then the Racetech is your best bet. They came standard in the comp coupe and the G4 ACR-X.
The interior dimensions of both those vipers should be close to your G5, keeping in mind the door panel has been gutted. Any fit issues will be on the drivers side.
To keep the fit better, you'll probably want the standard size vs, the wide.
I have a cobra seat in my G4, a wide version. To make it fit, in the stock door panel, a seat guy reshaped the upper and lower side bolsters (basically took some out but restitched it back all correctly)
Take a look at the picture, non-halo version, the upper bolster can be trimmed (look closely), so can the lower if there is a clearance issue. The most critical fit is the halo on the drivers side, can't trim that much.
As Mark of others have said, you won't have easy adjust ability. On mine, I have 1 1/2 of travel, but it requires unbolting the frame rails and adjusting. I'm 5'10, 36 in waist and we were able to position the seat great.
The key is finding someone who has fabrication skills and then figuring out a good location (forward/back as well as height and angle).
One note of caution, I was considering the Racetech halo, but a few folks advised me that it would be difficult on the street with visibility. Good luck and enjoy your new ACR!! Mike
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