I have changed direction on my build and have bought a set of Eisenmann's to deal with my 3.4 engine build, so as a result I have a brand new set of SSI's, thin flange, new and in the box.

This set was purchased in 2012 (I know, I am a slow builder) and were built prior to Dansk taking over SSI and, according to legend, are a better build than the current Dansk product.

Specifically they are:

SSI Heat Exchanger Set (pair), thin flange without O2 sensor socket, which fits:
911 (1966-74)
911 (1975-76 49-State USA)
911SC (1978-83 ROW)
911SC (1978-79 USA)

They will fit later cars ('84 to '89 911) but you will need to replace the exhaust studs in addition to the heater system modifications.

I am asking CDN$2500 for the pair, can be picked up in South Calgary or I can ship but buyer pays for shipper of their choice.