Suspension fork top caps I bought second-hand mountain type bike. Everything is fine, however, front suspension fork is missing top caps. 

As I currently don't posses the chance to visit bike repair shop (and have no other suspension fork equipped bike to compare available), I would like to ask, what do I need to replace. The fork is probably manufactured by Olpran (no other marks found) and I assume there was no option to regulate dampening force*

While looking for term "suspension fork caps" on the internet I found several replacements, however, they all seem to be mounted on some kind of valve (like this, image from ebay) 

Thank you very much in advance!


Disclaimer: I am total amateur with minimal knowledge about bicycles, however very interested.
@Michal,  I can't be certain from your picture, but your fork looks a lot like mine.  If it's the same kind of design, then the caps are simply plastic plugs, not threaded, simply friction-fit into the openings.

Here's a picture of the cap area of my fork.



If mine were missing I'd do just what @RoboKaren said, either make a plug out of a genuine cork champagne cork or maybe one of the plastic ones or (probably what I'd do) just duct tape over the area after cleaning the area with soapy water then mineral spirits to remove all surface contaminants and make sure the tape sticks.  You can get black duct tape if you want it to blend in.

BTW I'm assuming my suspension fork uses elastomer "springs" for the shock-absorbing effect, but I'm not positive because I've never been inside.