Product review (5 stars): For FWT449GFS1, you must buy this as part of a kit with a different item number (137523400)
If you have Frigidaire model FWT449GFS1 (among those listed above), which is about 16 years old, you need to buy this as part (137523400). The adapter harness you need apparently isn't sold separately. It's not a simple plug-&-play install, as with later models. The rather pricey kit contains a custom harness to adapt this item to the washer wiring. It also contains a replacement door strike, with a different design than the original, that fits this item -- along with some super glue and cable ties and instructions. Our washer was stopping in mid-cycle. I noticed that I could get it to run again by pushing on the door and holding it, but that it would stop as soon as I let up the pressure. That was the tip-off. To install the kit, you need to remove the top, back and lower front panel on the washer. Look at a videos posted for Frigidaire front-loaders on the RepairClinic.com YouTube channel for the how-to. They demo it on the same or similar model. You'll have to snip a few cable ties to free up the washer harness enough to install the adapter harness. There's and extra step for washers with older serial numbers, but ours didn't need it.