I read online on some forum that they are 8mmx25mm bolts and JD part number is 19m7867.
Use a jack with a board on top to support the engine. Loosen the bolts for the motor mount. Raise the engine slightly then take the bolts out and remove the motor mount. Install the new mount, tighten the bolts, then remove the jack.
The upper engine mount is on the passenger side of the vehicle right in the middle of the engine. There are 5 bolts holding it on. The bolts are a size 15mm deep socket. Remove the two bolts on either side. Jack up the engine from the bottom, underneath the oil pan, using a piece of wood between the jack and pan. Now remove the 3 bolts holding the mount to the engine. Replace the mount. Screw 3 bolts back in. Lower the engine and screw the two side bolts back in.
Engine mounts on 1997 Crown Vic are under the engine above the front frame cross member. There are three bolts that attach the mount to the engine, and two bolts that connect the mount to the frame mounting points.
Loosen the transmission mount retaining bolts. Loosen the back to engine retaining bolts. Jack the transmission of approximately 1 inch. Remove the transmission mount bolts. Remove the transmission mount. Reverse the process to install the new transmission mount.
Should be 6 bolts on the bell housing to mate it to the engine.
The belt side mount has bolts from the top along with the firewall side mount. The radiator side mount bolts are from the bottom and side. The transmission side mount bolts are all from the side. The top bolt is accessible after removing the fender liner.
Support the engine gently by spanning a wood 2x4 across the middle of the pan and jacking it up slightly. Then remove the engine mount at the upper passenger side. The entire bracket must be removed from the engine. This is necessary so that the engine can be slid to the right when removing the transmission mount along with its engine bracket. The bracket must be removed to or else the transmission mount can't be removed. There will be a total of 8 bolts to remove to allow the transmission mount to be removed. There will be a total of three nuts and 6 bolts to remove to allow the engine mount to be removed. Two of those bolts are accessed from inside the wheel well.
lift engine by removung the motor mount bolts. jack up engine and remove oil pan bolts
Begin by removing the engine wiring harnesses. Remove the motor mount retaining bolts. Disconnect the engine from the transmission. Lift the engine out.
* Raise the vehicle and support it securely on jackstands.Support the engine * Remove the mount and bracket bolts and detach the mount and bracket.The body to bracket bolts for the transaxle mount are accessed inside the left front wheel well;remove the four protective caps to access the bolts.The crossmember to bracket bolts for the front and rear roll stoppers are accessed through holes in the underside of the crossmember
Loosen the bolts mount in question. Raise engine by balancer to relieve pressure & pull the through bolt. Remove bolts to block. You may/may not be able to remove the pad on the frame. if you can, you can unbolt & slide the whole thing out, reassemble & replace or just raise engine enough to pop in new mount between pad & engine.
To replace motor mounts, they are unbolted and the engine is raised off them. You can use a mobile crane (cherry picker) to lift the engine. The mount is replaced with a new one. Install the engine mount bolts loosely on the block. Leave them loose during engine installation so that the mounts can be more easily aligned with the frame mount brackets. A rolling head prybar is handy when aligning mounts. Use the pointed end to line up the mount bolt holes before installing the mount bolts. A rolling head prybar is helpful when aligning motor mounts. Do not use the engine mount bolts to pull a V-type engine into place. Use shims if necessary to fill any gaps between the mount and block. The Automotive Engine Rebuilders Association reports numerous cases of block distortion resulting in scuffed pistons in cylinders, near mount that were forced tight.