I have been on the fence between the Steeda linear minimum drop and their Sport Progressives. They recommend a 1/4 ( I think) spacer in the rear for the convertibles. Other choice was Eibach Sportlines ( I think). Leaning towards the Steeda simply because I can do a full suspension including matched dampeners from them. Only issue is getting to Valdosta. I am in Georgia every 4-6 weeks but usually on the Atlantic side.
For the reasons I stated above, I would suggest you go with the Steeda minimum drop, since you are already looking at them.
I’m not a convertible guy so, although I’m surprised by possible spacer requirement, I can’t confirm or refute that part.
My instinct is that you don’t need them.
Do your research on that point.
Better yet, call Steeda direct and have conversation.
Once you’re dropped, the whole look will be different and you probably want to get rid of spacers. Give a bit of clearance for tires and fenders.
Avoid the Eibach Sportline. Those are an aggressive drop for show cars.
You will rub your splitter and belly if you go that low.
If you want to consider Eibach, it is the Pro Kit you should be looking at.
But those will still be low at 1 inch rear drop and 1.2 inch front drop, more than double the Steeda minimum drop.
Note: Granted, it’s not the same car but Mike21, on here, has the Eibach pro kit springs on his Mach1, and last I herd from him is that he is thinking about going back to stock height after getting tired of rubbing in a lot of places.
Happy shopping and modding.
Looking forward to future pics.