I sourced a set of 2014 Audi A4 S-Line heated seats for Mitch's LX. Without question, the best upgrade we've added. The leather is almost a perfect match...pics make them look lighter than reality (third pic shows seat's color better with an LX headrest sitting on the bottom). These are not the Recaros but the Audi Sport Seats. They have a bit more padding and not quite as much side bolster which translates to more comfort for the long haul. Ridiculously simple installation. The seat rails are flat and 19" apart so the only modification was to massage the little humps near tranny tunnel with a BFH to allow them to be centered on steering wheel. 1/4"x3" plate spanned the Audi mounting holes then welded on the amputated legs from an old set of 80 seats. Simple wiring and all functions work. Ridiculous amount of legroom and super comfy.
Similar to @halfkcruiser you can kiss the dash or butt up against the rear seats with the amount of travel on the slides. Using the 80's legs and 1/4" plate, the seats are about a 1/2" higher than stock. We could easily have lowered them 1" by fabbing shorter legs instead but not necessary for Mitch's position.
Update: I've been asked for more detail on how the brackets were made...didn't take pics. Started by cutting two pieces of 1/4"x3"x20"(might have been 21"...whatever the rails widest points side-to-side were). Drilled holes at spacing of Audi mounting holes 1" back from leading edge allowing the front plate to reach further back and the rear plate to reach further forward. The rear plate will have an additional hole for the locator pin. Cut legs off donor 80 seats and bolted in place to rig. With mounting plates bolted to seats with grade 8 button head bolts/screws, placed in rig atop the legs. Legs have a hole in the top so marked plate thru hole from the bottom and traced around leg flange. Took them all apart and bolted the legs in place thru their holes then welded secure. The Audi seat belt receivers were used with a slight massaging of the LX's buckle. Compared the LX buckle with my wife's S5 and the latch hole was in the exact same place but the tongue was slightly narrower and longer so a little contouring was necessary to mimic the Audi's shape.
Wiring was easy as these do not require an ECM or BCM to operate. I'm not a fan of splices so I sourced the "car-side" green and red plugs (black plug under seat not used) from eBay to match the seats. There are several wires on the red plugs that are not used for this install. I wired the movement Positive and Negative in the red plug (two fat wires...all the others are thin) to a distribution block he already had under the console off his second battery so they are hot all the time so we can move the seats without the key on. The Audi heated seat switches (A4 '98-'04 sourced on eBay) have an integrated relay so no exotic wiring needed and were installed in the blanks on the center console. The heated seats will have several wires running from the seats, switches and power source as shown on the diagram attached. I ran the heated seat's relay trip wire to the LX's power seat leads which are a keyed source and the main heat power to the distribution block a fore mentioned so they shut off with the ignition to avoid accidental battery drainage . In-line fuses were added of course (7.5a trip & 15a power for heat and 20a Thermal for movement). These heated switches have a matching car-side plug which I sourced on eBay but simple female spade terminals would have worked as well. Clipped the seat belt warning wire plug off LX seat and wired to Audi seat belt receiver and plugged in. Attached are a few pics as well as the wiring diagram I used for the heated seats (Audi plugs are visibly numbered).
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