Originally Posted by
due ruote
The unit is free standing, right? Ie. not currently bolted to the wall? Here's what I'd do; it would take 5 minutes and about $1 worth of materials. Shove the whole unit left until it butts the left wall. Square it up. Take about a 4' length of 1 x 2, hold it against the top 2 x 4 so that it butts the right wall, and shoot 3 or so screws into it. All done.
+1, but get some old carpet squares (samples from stuff no longer in stock at a carpet showroom or cheap rugs?) and staple it to the end of the new 2x4 and to the top corner of your current piece so it doesn't scuff the wall.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"