Those jackets are different than the originals that I have. It looks like they narrowed the "fork" end, so that the wireform can fit around it. It other words, the width shown where the spring bar rests used to extend all the way out to the end where the wireform is. Now, they have trimmed/narrowed that area.
My current jackets would not work. But with these pictures, perhaps I could take a dremel tool to my jackets, and make them work. The area where the spring bars actually rest remain unchanged, and well-supported.
thebrakeman ('70), DW ('71), DD ('99), DD ('01), DD ('05)
2004 Surveyor SV261T (UltraLite Bunkhouse Hybrid)
2006 Mercury Mountaineer V8 AWD Premier
Equal-i-zer WDH (10k), Prodigy Brake Controller