These fittings replace:
PET 911 69-73 Fig 1-01-05 #71) 999.136.008.09 Connection piece, A 16, 72- (22x1.5 & 30x1.5) Qty: 1 SS->999.136.008.01

Material: Titanium, Gr 5 (6AL-4V)
Finish: Ra 12µm (As machined)
Weight: 40.30 grams (30.68 grams less than OEM)

They take:
PET '69-'73 911 Fig 1-01-05, #69 900.123.011.30 Sealing ring, A 22 X 27 Qty: 1

The price is $32.18 each.
Shipping within the US is by choice of USPS Priority ($6.80) or Parcel Post ($3.00).