I experienced the same problem last weekend with my 87 300D. When my 80 amp strip fuse went out, the heat must have so great that it caught the plastic glow plug relay on fire. Fortunately, I smelled it when I later took the garbage out to the garbage cans in the garage and I put the small fire out before it did any significant damage.

On line, you might try ******** AZ as they have the 80 amp strip fuse listed in their 123 section.

DBW