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I picked up some used Hall lowering springs awhile ago, but thinking maybe these are for a coilover setup. We got these mounted on the shocks, but we didn't have to compress the spring onto the shock which is probably the first red flag. These are just the fronts, and the Hall front springs were definitely shorter than the stock springs, and had a thicker coil which makes sense since they are stiffer springs. But thinking maybe these are for a coilover setup and not for use with the Aristron shocks which is what I have. My car is sitting on the lift and I don't want to keep screwing with this if these won't work.

These can't really work in their current state because anytime there is no tension on the shock, the retainers would pop off, which would lead to a dangerous driving experience is my guess.

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Looks like they must not be for use on the stock shocks or it is some very odd Hall mod. I don’t think I’d drive it that way because like you say the locks could fall out. But for that to happen, the suspension would need to extend fully, not sure that could happen on the street. You might find a way to tie the spring assembly up to the upper shock end using wire ties to keep the locks from falling out.

If you just take the spacers out of your stock shocks and use stock springs you’ll have a euro ride height that is pretty nice.

I installed the Pantera East Koni bolt in setup and found that lowering the car 1” more in the front and ¾” in the back from euro was about as far as you would want to be and still feel safe running on the street. I only have 3 5/8” clearance at the lowest point. Note how the wire ties were used on my coil over to keep the spring in position. But the upper mount is held in with a clip so it can not come out.

Can’t tell for sure in your picture, but your arm bushings might be ready for replacement and that is lots of fun.

As you say it looks like these were intended for a more traditional coilover shock body. But even Hall's Aldan shocks used short springs that were not fully compressed in the shock when the car is in the air.

Unless you are doing "Dukes of Hazard" style driving I doubt your suspension will ever be unloaded enough to allow the retainers to come out.

That said there are options;

1. Cheapest; drill small holes in the two retainer halves and safety wire them to a spring coil or to each other.
2. Get helper springs; these are small flat wire springs that are just enough to keep everything extended when the shock is unloaded and remain compressed under load.

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