Need to find compatible roller set

I have a 35-40 year old patio door and am trying to replace the rollers. However, the new ones I see have two screws, with the upper for fastening and the lower for adjusting the rollers. Mine have only one screw, in the "upper position" (which seems to correspond to the modern-day attachment screw location. I bought a replacement set, but there is no hole in my door frame allowing access. Unless I can find the correct roller assembly, all I can think of is drilingl a hole in the right spot on my door frame, to allow access to the adjustment screw. Any suggestions?

The dimensions of my original wheel assembly are 1 1/4 diameter wheels; case is 1 1/16 wide x 3 1/8 long x 1 1/16 high.

There are no identifying markings on it. Thank you.

John 

Dave, that looks exactly right. I just ordered a pair. Thanks so much for steering me in the right direction.

John