It's become pretty clear to me now why my manual top catch bracket assemblies had the tubular extension pieces (the extension pieces measure 3-3/8"). It's because the previous owner did an approximate 3" mini-tub to the rear wheel wells. Apparently, he also shortened the cross-brace as part of this mod. Looks like I'll need to reuse the extensions. When the bracket is placed over the mounting holes on the cross-brace, the nylon catch is about 3+" from the point where it needs to catch the frame. See attached photos for measurements of rear wheel well. What are your measurements? Thanks.