I know your question was from a long time ago, but I have the manual and would be happy to send you a copy if you still need it.
How Can I Find A Manual For Vogue Stitch Model 8058 Sewing Machine?
Have you searched eBay and Craigslist? I often see manuals for sale on those sites.
I have found a great website while searching for Stitch sewing machine model no 8058 that provides manuals of almost all sewing machines so you can check this website to get one for yourself.
www.sewusa.com
www.sewusa.com