Tremec TKO's are not a drop in. I put one in my GTS and you have to cut the floor, cut out part of cross member, build a new tunnel and part of the drivers side floor when the hump comes out as you don't need it. The Ford version of the McCLeod Muscle Car 5 speed may work, no one has done it yet that I know of. Passion 5 speed would be a drop in, if you like to wait to get one. I think some people have fit a Mustang 5.0 T5 but it still possibly requires some floor work and there are no drop in kits for it and they are only good to about 300 ft/lb of torque, they can be upgraded for more money. There is a Toyota 5 speed that fits a Dakota bell housing, that swap is documented. Richmond has some transmissions but these there is little install info on too. Drop ins are an 833 or 833 OD.