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I would deem the 2 thermostats on the left as unusable for a B18/B20/B30 Volvo engines due to the size of the disc on the bottom. The disc is an important feature and those 2 most likely will NOT properly cover the tube under the thermostat. When that tube is not blocked off when the thermostat opens, hot water will be recycled back to the head instead of going to the radiator to be cooled.
I especially don't like the amount of excess silicone glue visible on the center thermostat. Do you not have the correct rubber seal ring?
And if the water pump has a similar amount of silicone glue, it is highly likely that some silicone broke off and may have plugged the water distribution pipe inside the head.
The thermostat on the right looks like the right type. Did you test that 1 to see if it works?
BTW, here is the picture you wanted to post. It is not as easy to post pictures here, but with a little HTML knowledge, it ain't that hard.

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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502
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