Hi
I have the following available - not exactly your No. 1 requirement - but great offers:
Stronglight light alloy chainring, 135 BCD to fit C-Record spider, 40T, USED, £6,50 plus postage £3,50
as well as
Campagnolo Chorus (C-era) light alloy chainring, 135 BCD, 53T, USED, £6,50 plus postage £3,50
Both have life in them yet - the 40T probably a bit longer life than the 53T.
If both are bought together, combined price £12 plus £5,00 postage
Let me know
Cheers
Colnagolover