I have a number of 8 foot doors with single latches. Only the french door is a significant problem - they are solid wood entry doors and the sealing is not perfect although there is no warping after 3 years. Triple is definitely better but you don't have too....We have them at a house in high wind areas and they are great. That area requires triple latch on all doors with glass I think - we have it on a glass 6'8" door (as well as a 8 ft door) but not a solid one. Anyway - they seal great and the security is amazing. Imaging kicking in a door with triple point latches into a steel frame.... Style is one thing - air sealing, longevity and security are another. I honestly think I would do triple point on any exterior door if money wasn't an issue.

suzannesl: Thanks for the suggestion :) I seem to be striking out. Any ideas on where to find cabinetry shops that may not be listed? This is an expense I wasn't planning on but will have to do if I can't find someone to make these doors for a reasonable price.

I don't think you'll find a better deal than replacing the slider for $465. Anything else is going to be a special order, with special handling and special pricing.

Depending on your style or your budget, in our 1890's house, the odd sized doors were made with planks of wood and horizontal or X version brace across them. They are painted, they have the old time handles....smaller turn knobs, exterior door jams, and they work fine. This is upstairs in an addition that was made. The grandkids actually love them even more! It's just a door. Not a gold mine. Do what is most economical, even if it is temporary till you find the person remodling tearing down the old house with the doors that fit your opening?