[Zakopious]

Don,

You did a nice job of covering up your score lines.
I think that any fold will show some white regardless of scoring on the back or front.

I use a small, cheap, very dull, stainless-steel pocket knife for scoring.
The knife will not hold an edge but is perfect for scoring.
The cardboard back from a legal size paper tablet is under the cardstock when I score.
Thus, the cardstock is indented but not cut when scored.

After looking at the quickbuild PDF, it does appear that there are two left sides for the suspension.

It should be easy to copy the part and make a mirror image in your favorite graphics program, i.e. Gimp, Paint, etc.

As a quick and dirty experiment, I copied the part, pasted it into Paint, and did a flip/rotate in Paint and got a mirror image.
Of course, getting it to print at the correct size may be harder.

Ken