The oil filter was an option back then. It may or may not have one. If it did have one it would be mounted to the intake manifold on the drivers side and highly visable. We used to call them the "crap can". The filter is a cartridge type inside the can.
There are many websites that offer information about a 1955 Chevrolet truck. For example one can find detailed information on Wikipedia by looking at the 'Chevrolet pickup truck' category.
approx 3800lbs go to a weigh station if you want to know more accurately
66,833 Series 150 250,000 Series 210 168,826 BelAir Total 485,659
go online to lmc truck.com to find Chevy truck parts or grumpys.com
1956 gmc 3200
Datsun Truck was created in 1955.
Offline, it is worth asking at a local Chevy car dealership as they may be able to advise where to purchase one from. Alternatively, online the Ebay motor shop has some available.
1955
All chevy truck had a small rear window up until the 1955 was produced. The 1954 had one small rear window flanked on either side by very small windows.
1955
One could start to look for a 1955 Chevy for sale online at eBay where there are many used cars for sale. The website Cars On Sale is also likely to sell a 1955 Chevy.
i have one, bought it that way. was done in the 70s.