Brand new accumulator.  Fits all 1989-1991 Chrysler TC by Maserati. 
 
The units I have are new stock (not old stock) and these hold pressure just like they did back in 1989-1991!    Very nice, brand new units made by the OE manufacturer for Chrysler.   We only have a few left, once they are gone, they're gone!
 
If you have noticed that your ABS pump is running a LOT, it's time to replace your accumulator.  These are supposed to be changed every 50k miles or 7yrs whichever comes first.  These cars are now 35+yrs old and I've seen several out there that still have their original accumulator in them. 
 
These worn out accumulators are what cause your pump to run all the time which eventually either burns out the pump or (worse) burns up your wiring, the little 3 relay ABS box located in the passenger front inner fender area under the hood.... and your pump.   
 
These are easy to replace, if you need installation instructions just let me know in the comments and I'll be happy to include a set for you with the new accumulator.