The DO-214 is the diode "package" type, not the part#. You need the correct p/n.
Ddifferent diode package types have different lengths and wire-lead diameters.
On the others, whenever you see "SOxx", it means SOIC package type. The pins have
1/2 the normal spacing [0.05"], and are 1000X easier to solder than smaller smt
package types, like QFN/etc. SOIC8 is 8-pin, SOIC14 is 14-pin. Easy code.
Your capacitor is either a "C" package or a 3225 package, not really both, thats likely the issue you had in finding the part. The diode is a high speed type usually used in switching regulators as the 'catch' diode, it should work UNLESS the design calls for schottky diodes ( junction and point contact diodes have different conduction potentials) If it does, use them as the designer had a reason for calling out that part. Substitutions are ok... if you know why, then you know as much as the designer did and you wouldn't be asking questions...
the 'cap' is being used on the speaker+ pad from the audio/amp..etc
does that help?
and for the diode.. I guess I have the wrong one picked.. it should be a schottky type..
couldnt find anything in the size I could be sure of (or anything) at Digikey..,but I think maybe this one will work from Mouser for the DIODE: (pad size/package DO-214AC)