A contractor from Norfolk VA. says:
March 1, 2012
This is a thin roller with the adjustment screw on the side twards the bottom the wheel is flat not concaved had 175 stamped on roller. Door manufacturer ? couldnt make out ?? CBC 7/84 CRC? QEA? GEA??
Paul from SWISCO responded:
March 2, 2012
Thanks for posting. Please take a look at our 81-011 capitol patio door roller. Do you think this might work for you? Make sure to match the dimensions to your own hardware. If you aren't sure, please post the dimensions of your roller for us to see.