There is a fuel filter on the driver side framerail and also a "bag" filter on the pump inlet (in the tank). I wouldn't worry about that one unless you're having issues.
It is made on to the clutch slave cylinder that mounts on the side of the transmission.
In essence, yes. They are a trim level. So it's the same truck with different trim level packages.
If it is where the filter meets up to the mount there actually is a gasket there. If it past the mount you may need to replace the filter housing.
Yes
No they will not.
It is mounted under the drivers side of the truck up in the frame rail.
depending on model of truck.
Well, your 1990 Chevy Cheyenne came OE with P225/75R15 however, in this case you can use P235/75R15 it is more common and cost less. COO of TireTyre.com
No.
most 88-98 Chevy pickups are basically the same. the only difference between yhe cheyenne and silverado is the trim.
Diagram of 1990 chevy truck steering column
yes, they should be identical.