Pedr,
Your pic of #5078 is interesting to me because although I assume this is the second WA carrier off the production line, it doesn't have the all metal front idler wheel nor the metal return roller. I found these to be fitted to Carrier 5174 (WA # 98) and assumed that all the carriers made under the WA contract had these as standard.
Maybe the ones on #2 were changed for the older style at some stage in its history ?
Pics attached show the wheels I mentioned, before restoration started.
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