1990 brake booster

[fixkick]

yes, 89/90 are generation 1 cars. here.
and parts hard to find, did you try gm/geo
oops , discontinued.
cardone (cardone makes the but does not sell them retail, you can special order them at most good stores,(NAPA::?)
http://www.cardone.com/Products/Product-...=1990&info=
google search above
https://duckduckgo.com/?q=cardone++53-22...a=products
none
reybestos has piles of geo parts, but not this part.
https://www.brakepartsinc.com/raybestos/...earch.html

wagner, lots, but no booster

amazon shows 1.
https://www.amazon.com/Cardone-53-2280-R...automotive

used , sure,lots, click 90, , then chevy tracker, then booster

http://www.car-part.com/cgi-bin/search.cgi