How about this? It looks simple, but it's designed for engine oil, does that matter?
http://www.summitracing.com/parts/PRM-1761/
Can I get any spin on filter for this that has 3/4" x 16 thread?
Will this be ok with WVO?

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1983 300D TurboDiesel

There is this option as well. http://www.greaseworks.com/store/product_info.php?cPath=21_38&products_id=427

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Yes but that's really expensive and also has electric heating already. Whatever that head is looks great I just don't need the heating element; I'm doing that myself. I just need that head element that the filter screws into. That one in the picture even has screw holes that would make mounting easy. If that is available alone please tell me where.

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1983 300D TurboDiesel

Your local autoparts place may sell the sameone.

Concerning a 5 micron Fuel Filter.

Below is a thread where one of our members Deliveryvalve had stock filter Housing mod he wanted done.
The mod was all his idea but I did the threading.

It uses a Baldwin BF7591-D; the D means it has a drain screw at the bottom to drain off accumulated water. This filter is threaded for M16x1.5 threads and that is the same threads used on the older VW Rabbit and Volvo Diesel Fuel Filter Housings.
So while I gave the below thread for reference purposes you could just get a older VW Rabbit Filter Housing and use that.

Post #12 has the micron spec sheet on the BF7591-D
http://www.peachparts.com/shopforum/showthread.php?t=225004

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84 300D, 82 Volvo 244Gl Diesel