The insulator is the same for all the 4g63 motors that came in a DSM, so yes a GST and TSI use the same part. You can check I with the stealership, but I'd use one of the vendors on this Forum for a part like that. STM or JNZ would be where I'd look, I think I also saw something in the Tech section with a DIY solution.

http://www.streettunedmotorsports.com/parts/oem_dsm_fuel_rail_spacers.htm

Mitsubishi P/N MD095402. Same from '90-99. You can order them from the dealership too.

The next time you install them, run a bead of RTV on the bottom so the stick to the head. That way when you remove the fuel rail next time they don't fly off into that black hole under the intake manifold.

http://www.streettunedmotorsports.com/parts/oem_dsm_lower_injector_insulator_rings.htm

You need a fuel rail spacer or insulators/seals?

lower insulators I'm leak testing everything and after having the intercooler pipes welded and made into a three piece set i the new leaks from the injectors started making big hissing but, my question was will chrysler carry the parts because in san diego county there is plenty of dealerships that i can go to but closest to me is chrysler.

Are you on stock injectors? Call and ask Chrysler. Tell them its for a 93 Plymouth Laser.

I usually buy mine (and a extra set) online from extremepsi.com

Do not get anything from felpro when it comes to injectors. All their rings are the wrong sizes. Even though it has been reported to them many times they still continue to pump em out.