Note about the Oliver 1250 GAS Tractor ...  

I have nothing in the way of Tune-up items, Carburetor, Coil, Governor . . . etc.  
The best advice I can give on this is make a post on http://hartparroliver.org on their "Forum" link.
Also on the Oliver 1250 
... I have NO Front Grilles, Head Lights . . . No Ignition Parts, Governors, Fuel Pumps, . . . 

WATER PUMPS . . . I HAVE NOTHING
(Gas or Diesel)

http://www.hartparroliver.org/

Oliver 1250 Gas & Diesel
Power Steering Pump

673068AS Pump Assembly

I HAVE NOTHING !
Oliver 1250 Gas & Diesel
Power Steering Pump

673068AS Pump Assembly

I HAVE NOTHING !
I HAVE NOTHING !

Oliver 1250 

670991AS Fuel Pump
Ignition Parts References:
OEM # 671777A Distributor Cap
- FIAT # 9908428
- NAPA # EP211
- DELCO # E351
- BORG # C628
- BOSCH # 1-235-999-012
- SORENSEN # G58
Ignition Parts References:
OEM # 671800A Rotor
- FIAT # 9910022
- NAPA # EP221
- DELCO # E464
- BORG # D551
Oliver 1250 Tractor Parts are pretty much non-existent.

The best advice (only advice) I can give on this Model is make a post on http://hartparroliver.org on their "Forum" link 
and also start trying the Salvage Yards.
Over 40 Years in the 
Agricultural Parts Business

Categories - Main
Also on Oliver 500 & 600 Tractors
contact Nelson LeCount
260-761-3155
​- - - -
I'm not your guy on these models either
FYI - Effective 05/05/2017, Randy Lund has a Generator/Governor Assembly for sale. Randy can be reached at  989-291-5093

FYI - Effective 7/24/2017, Stanley Tvedt is looking for several items.  Give Stanley a call at 507-365-8237 around 7:00 > 7:30 AM Central time, if you can help him.