These are dxf files to bend and weld it yourself. You must have access to a bender that can bend 3/16” steel and a way to cut the parts out accurately. The files are in millimeters.

These will also require wheel spacers in order to clear your tires unless you have at least 3.5” backspacing.

The upper mounts are designed to bolt onto 3 of the 4 bolts that hold on the gas tank/muffler crossmember. They use a ⅝” diameter stud that is fully welded to the mount, which is smaller than the lower OEM mounts (19mm).

The lower mounts reuse one existing tacoma spring seat (ubolt plate) and one pre-tacoma pickup spring seat. The Toyota pickup has the opposite shock configuration to the Tacoma. Using these bolt on mounts will prevent any welding damage to the axle seal when welding on lower mounts.

These move the upper mounting point 3” further from the lower point than stock. Therefore you will need a shock that is 3” longer extended length than stock. I am wording it like this because there is not a one-size-fits-all shock solution for this kit. It will depend on a variety of variables, but it is mostly related to the travel of your leaf spring pack. The great thing about these mounts is that you can install them, and then measure your distance to the axle at full compression and extension. With that information you can order the most appropriate shocks for your setup.

The stock tacoma rear shocks are as follows:

Rear left
Extended Length: 19.61 Inch
Compressed Length: 12.8 Inch
Travel: 6.81 inch

Rear right:
Extended Length: 20.28 Inch
Compressed Length: 13.19 Inch
Travel: 7.09 inch

Right now these are specifically designed for bilstein 5125 shocks. I have not done enough test fitting with any other shock, so I cannot guarantee clearances.
I made another thread while I was researching shock options here: 1st Gen Tacoma Rear Shock Info (Aftermarket)

Parts you will need to buy:
(1) Pre tacoma spring seat part number 48046-35170
(2) Shock stud to weld on: https://amzn.to/4A4IC2e
3/4” lower bushings and 5/8” upper bushings

See more information here: https://www.tacomaworld.com/threads/feeler-1st-gen-tacoma-bolt-on-outboard-shock-mounts.794657/