Roller Assembly needed for wooden patio door

A home owner from Lenexa, KS says:
When my home was built in 1978 or 79 a Pella sliding glass door was installed leading to the deck. The door is wooden construction but has no metal cladding. After careful inspection I have been unable to find a model or serial number on the door. One of the roller assemblies has failed making the door rather difficult to open and close. Thus, I am hopeful that you can tell me what door model or models were in use at the time our home was constructed.

If I can provide you with any additional information which will make identification of the door model easier, please let me know. Thank you.
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Dave Sr. from SWISCO responded:
The only way to determine which roller you need is to remove your existing one from the door. I think it could be either the 81-249 generic roller or the genuine Pella 81-098 roller. These are for the older Pella doors. We also carry the 81-244 for the newer style doors. However I'm not sure which one of these will fit your door. That's about as far as I can narrow it down without seeing the original out of the door.
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