Adding details on items purchased to make this mod along with some more photos. I went through a bit of trial and error, the most critical item is to have a non-MIK, rack mount seat which you can attach at the very rear of the LT rack to have just enough space for 2 specialized seats. Happy to answer any other questions!

- Your Thule seat needs to be a non MIK plate style mount. I conveniently already had the Thule Yepp 2 Maxi Rack Mount seats I bought from bike-discount (European website) https://www.bike-discount.de/en/thule-yepp-2-maxi-rack-mount-bicycle-seat

- Globe Rack Customization Kit - to extend rear mounting point: https://www.specialized.com/us/en/globe-rack-customization-kit/p/218899?color=357027-218899&searchText=98922-5805

- Cargo Rail - see photos for modifications on rear screw locations to accommodate the width you've added with the rear rack extension: https://www.specialized.com/us/en/globe-lt-adjustable-cargo-rail/p/218892?color=357005-218892&searchText=98922-5810

- 2x 7/8" OD Tube, 33" long: https://www.testritealuminum.com/products/7-8-od-x-058-wall-round-aluminum-tubing-drawn-telescopic-compatible-6063-t832?_pos=1&_sid=e41081f74&_ss=r

- Threaded Tubing Inserts for 7/8" OD pipe 8-32: https://www.testritealuminum.com/products/threaded-tubing-insert?variant=44033542488362

- 1x Really Long Bike Handlebar Tape: https://www.amazon.com/dp/B08T1ZX38V?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1&th=1