I don't think the position of the thread supply holder is critical +/- an inch or two as the post can be turned which results in changing the fore/aft and left/right placement of the thread reels. Also, as far as I know, it isn't critical which peg the active reel is placed on.
The other deviceis a bobbin winder, driven by putting the wheel into contact with the sewing machine's drive belt. Alignment and placement need to be reasonably accurate for proper function. If your wayward engine damaged the bobbin winder assembly, they are readily available on ebay and elsewhere. Since they seem to be pretty standard, you can likely find existing holes in the table to mount your existing or replacement winder (likely the thread reel support too). Searching the make/model of your sewing machine will likely let you download a manual for it.
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