Evo Classic Front Rack
 

No problem connecting the bottom of the rack to the front dropout. Received screws and an adapter but the screws didn't fit the top of the fork hole and perhaps not the adapter. I imagine I want a hex bolt for the fork hole and something similar for the adapter. Could maybe figure it out with a trip or two to a hardware store but maybe someone here has experience. The bike is a Men's Ross Mount Washington (mountain/road).

Post some.pics, would make things more clear, show fork holes and this adapter you are referring to.

this rack?

EVO Adventure Front Rack Black from BikeBling.com

Advertised as that but I think I got the Classic. The Voyager label isn't on mine but it looks pretty much the same. Today I picked up M12 screws which appear to go snugly through the rack and may close nicely under the adapter with M6 nuts. Still working on the fork - M14 screw may be the best bet but I may need to cut it in order to have the M6 nut close.

Not sure if you are taking about bolt length but you can use spacers, and those screw on round things on presta valves make handy little spacers for rack bolts if the bolt is too long. I've used them before and they do the job.

pictures would help. this is your basic blackburn clone?

adapter? you mean the long (usually) flat metal strut, usually with some
bends in it? bolts to bottom of rack, other end bolts to fork crown?

if so, and it don't fit....throw it in the parts bin for another day. just
about anything will work. i'm pretty sure the weight is carried by the
legs, the support strut/adaptor mainly holds the rack in place.

i hit the maintenance shop here at work, they got a couple hundred
wall-mount fans getting thrown own....pulled some metal support
strips, bent-cut-drilled one to fit.

and do use them self-locking nuts......

We would love to help, but I feel I'm not really sure what part you mean.
Do take some photos and that way you'll get some more concise suggestions.