parts-quick 128MB Memory for Akai MPC500 MPC1000 MPC2500. Equivalent to EXM128 https://www.amazon.com/dp/B004F9B6ZK/ref=cm_sw_r_apan_i_VE3F77M5ECWVV90HA1VK?_encoding=UTF8&psc=1

The description doesnt really have exact specs unfortunately. I trusted the description that said it was mpc500 compatible. Ill probably just return it, i doubt there is much to be done. Ill try the alcohol thing first, thanks for the tip!