are a shot in the dark......some will respond, some won't, some will send the part, some don't....it's a real gamble.
While we are on this topic, don't you think that having a source of spares would be 'normal' given the escalating prices of these models ? I think the manufacturers should do a MUCH better job of providing spares than they do presently. If the part being replaced is broken/missing , the the spare should be a freebie if you return the broken bits. If you just want the part for you 'parts bin', then some nominal charge is perfectly OK. Missing parts would best be handled via a photo, as we see here. And just to make sure the requests are legit, a dated sales slip needs to be included for 'warranty' replacements. Expiration date TBD by each manufacturer.