We got ours from TDS Transformers. They actually made them for Matchless. TDS15 & TDS30
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TDS 15Watt Transformer set.jpg [ 1017.41 KiB | Viewed 5389 times ]
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TDS 30 Watt Transformer set.jpg [ 848.34 KiB | Viewed 5389 times ]
We have this West Labs info:
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westlabs trannies.jpg [ 79.82 KiB | Viewed 5389 times ]
They should be compatible.
The 15W powers West was selling here looks identical to many TDS made for Matchless in the past. These are different dimensions than the ones we had. You can tell these are not TDS because of the stickers on them.