Bicycle Mechanics - Need rear QR skewer to fit 135mm dropout spacing

I've got a Nashbar "Chain Master" chain guide and didn't realize that it doesn't include a QR Skewer. The dropout spacing is 135mm (Hardrock frame). I'm not interested in using my rear wheel's present QR skewer.

Is a "generic" rear hub skewer assembly going to fit? Nearest LBS is an hour's drive away I'd prefer to order online if I could.

There is a difference in length between road and MTB skewer lengths. However, I think most companies anymore ONLY make the longer ones that are now used on most everything. I may be wrong on this, but most of the late-model generic spares in my parts box fit either road or MTB hubs. I'd buy a pair of Shimanos on e-Bay if I were you. Sheldon Brown says they're better than the generics.

For the use you require the cheapest generic is plenty good enough.

Sheldon's recommendation about using Shimano (or Campy) skewers is more about their design than the actual manufacturer. Others make similarly configured skewers.

The Shimano/Campy design gives much more clamping force than many of the very light boutique "external cam" skewers and holds the wheel more securely. This a particular requirement with horizontal dropouts in older frames or fixed gear/track bike use.

For safety, use shimano(or Scampy) or economy, use cheapo deeluxe version

For safety, use shimano(or Scampy) or economy, use cheapo deeluxe version

He is going to use this skewer to hold a plastic guide used to keep the chain in place for cleaning while the rear wheel is out of the frame. The requirements for this are extremely low. The cheapest generic is plenty good enough.

He is going to use this skewer to hold a plastic guide used to keep the chain in place for cleaning while the rear wheel is out of the frame. The requirements for this are extremely low. The cheapest generic is plenty good enough.
Yep.

I'm not particuarly concerned if the physical length of the skewer is too long. I'm just concerned if the generic skewers are going to be too short. Probably not.

I went ahead and ordered a pair of QR skewers for MTB's from Price Point. They are the Sette brand. The pair cost around seven bucks.