I have 2 sets of manifolds for sale...
First set is for Weber 40s or Zenith 40s and measures 40mm at top and 32 at the bottom $200 set
Second set appears to have been machined from 40s to 46mm at top and 38mm at bottom. $250 set
Both sets in good shape with all studs.
Prices plus shipping... pictures available.

Speedo