This is the one I bought, is recommended by a modding guru at a Fusion forum (2GFusions), and works great: https://smile.amazon.com/gp/product/B01F0GVBWY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Don't know if you can get it from Amazon Germany though. I thought the vendor, OHP, was based in England but not 100% sure.... Looks like they're from Estonia after all.
You have a couple different options. I've never messed with aftermarket systems, so I'm not sure how well they are. But you could just pick up new fobs for it and program them according to the aftermarket directions.
If you want to go with the factory system, you basically have to add the RF receiver to your car, enable RKE in Forscan, then program the fobs.
The RF receiver is this: https://www.ebay.com/itm/05-06-07-08-09-10-11-LINCOLN-TOWN-CAR-ANTI-THEFT-LOCKING-CONTROL-MODULE-OEM-65k/274423571851 - it is in the passenger C-pillar under the plastic trim, in pretty much any 08+ Panther. You can use the module from a TC, MGM, CVLX, doesn't matter. You need both pigtail ends as well to make a mini-harness, so I would look at your local junkyards first before resorting to an ebay buy as most ebay listings I've seen do NOT have the pigtail ends, or will only have one.
You plug that module into the DDM (Driver Door Module, literally a central module under the front driver door panel, you can just mount the RF antenna wherever it will fit under the panel.) Then you need something like this, or the WiFi version of it:
https://www.amazon.com/OHP-ELMconfig-Adapter-Compatible-Diagnostics/dp/B01F0GVBWY/
to connect your car to your PC for Forscan. You then need to modify the DDM as-built data to enable RKE.
This is the one I bought and it works perfect: https://smile.amazon.com/gp/product/B01F0GVBWY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Always watch out for cheap, Chinese knock-offs but this one and the one posted by MrBr1 are from OHP so either should be good.
If you don't want to spend as much, I bought this one
https://www.amazon.com/gp/aw/d/B01F0GVBWY?psc=1&ref=ppx_pop_mob_b_asin_title
And it's worked perfectly without any issues whatsoever.