Help needed pls .

I recently bought a used set on Amazon on the Thomas with annie and Clarabel  n scale set . And Annie and clarabel had missing couplers . So I messaged Bachmann . If they had the parts for Annie and clarabel couplers but they told me
" I am sorry to say that the couplers on the rolling stock car is special made. " and I have to ask the forum and ask the modelers there if they may know where i could get the couplers.so Pls tell me what coupler they have so I could get new ones. Or pls send me a link where I could buy them . Thank you