My FD didn't come with a jack, and I want one in the car in case of a big flat. Are there any options outside of the OEM $100+ used jack that fit in the jack mount?

 

Infiniti FX model (and probably other models too) jacks are very similar in size and form. Personally I cannot confirm it's a 100% fit in the jack boot, but it looks like so.

https://www.ebay.com/itm/176014209101
https://www.ebay.com/itm/175900905145

 

I have the OEM scissor jack from my old '03 Protege5 sitting around that I verified fits my '93 FD and can be properly secured in the FD's OEM location. It has about the same min/max lift height dimensions as the OEM FD jack, and almost identical pinch weld slot dimensions as the OEM FD jack too, so it will work with the FD just the same. Major difference is the FD jack is made of aluminum (vs. steel), so it weighs a bit less. If you're interested, PM me - I'll sell it cheap, say $20+ shipping cost.