Jwa, did you know that all the '55 & '56 Wagon models had a 1 inch diameter front anti-sway bar, while the car models had a 3/4 inch bar, but lengths and bends are identical for both. True, Mercury did have shorter lengths after the bend (which increased the amount of stiffness and reduced body roll).
Okay, so on my '55 Ford Courier wagon, the first bolt-hole for the sway bar bushing bracket under the frame is exactly 7-3/8 inches back from the front of the frame. (That is the original bolt-hole for the original anti-sway bar). I looked at my '55 Ford Fairlane car also and the sway bar bushing bracket is in the exact same place.