There is not enough room to add a sandwich thermo adaptor and
oil filter on a Unique. I just ordered the following form pegasus racing to add an external thermostat.
2 3271-10-000 straight AN10 $8.99 each
1 1226-10AN Thermostat $93.69
3 3270-10 Ft of SS Braided Hose $5.79/ft
2 3271-10-090 9- degree AN10 $21.99 each
for a total of $173.02
(granted I had all the rest of the stuff before).
The pic represents my set up. The lines between components represent SS braided hose.