You have a Thompson pump and it depends on the R suffix on the pump for the seal. If the rear seal is smaller than the front the front seal number was 363781R91.
Don't know if these numbers are still good but wrote down in the past I used a National 473412 or a CR 8842 for that seal. Also the seals were used to replace the same number you had in the pump.
Pump was probably changed sometime, because it probably came with a Pesco pump if originally on a SM.
Just looked at messicks site. They have a picture of # 363781R91 with CR 8842 on the seal. Can't remember for sure but thinking I preferred the national seal the last time. But everyone is always changing quality of the parts they make. So not sure on the present.
This post was edited by D Slater at 12:55:55 03/01/15.
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