- Kurzweil DADAT-26 - ADAT Option Card For K2600 And K2600R
- Kurzweil DIO-26 - For Connecting A DMTi To K2600 And K2600R
- Kurzweil FK-1 - Fan Kit For K2000
- Kurzweil HDC-25K - Internal Hard Drive Mounting Kit For K2500
- Kurzweil HDC-25R - Internal Hard Drive Mounting Kit For K2500R
- Kurzweil HDC-26K - Internal Hard Drive Mounting Kit For K2600
- Kurzweil HDC-26R - Internal Hard Drive Mounting Kit For K2600R
- Kurzweil HDC1 - Internal Hard Drive Mounting Kit For K2000 And K2000R
- Kurzweil KDFX - Effect Unit For K2500 And K2500R
- Kurzweil KDS Digital I/O - For Connecting A DMTi To K2500 And K2500R
- Kurzweil P/RAM For K2000 And K2000R
- Kurzweil P/RAM-2 For K2500 And K2500R
- Kurzweil P/RAM-26 For K2600 And K2600R
- Kurzweil PC2SRIB - Ribbon Controller
- Kurzweil RMB-26 - Soundblock Daughterboard For K2600 And K2600R (needed to install ROM expansions)
- Kurzweil RMB-K - Soundblock Daughterboard For K2000 And K2000R (needed to install ROM expansions)
- Kurzweil RMB-P2 - Soundblock Daughterboard For K2500 And K2500R (needed to install ROM expansions)
- Kurzweil SIMM Memory
- Kurzweil SMP-2K - Sampling Option For K2500
- Kurzweil SMP-2R - Sampling Option For K2500R
- Kurzweil SMP-2X - Sampling Option For K2600 And K2600R
- Kurzweil SMP-61 - Sampling Option For K2661
- Kurzweil SMP-K - Sampling Option For K2000
- Kurzweil SMP-R - Sampling Option For K2000R
- Kurzweil PCR-1 - Orchestral ROM For PC2 And PC2R
- Kurzweil PCR-2 - Classic Keys ROM For PC2 And PC2R
- Kurzweil PCX-2 - Classic Keys ROM For PC1X
- Kurzweil RM1-26 - Orchestral ROM For K2600 And K2600R
- Kurzweil RM1-P2 - Orchestral ROM For K2500 And K2500R
- Kurzweil RM2-26 - Contemporary ROM For K2600 And K2600R
- Kurzweil RM2-P2 - Contemporary ROM For K2500 And K2500R
- Kurzweil RM3-26 - Stereo Dynamic Piano ROM For K2600 And K2600R
- Kurzweil RM4-26 - Vintage Electric Piano ROM For K2600 And K2600R
- Kurzweil RM5-26 - General MIDI ROM For K2600 And K2600R
- Kurzweil ROM-1 - Contemporary ROM For K2000 And K2000R
- Kurzweil ROM-2 - Orchestral ROM For K2000 And K2000R

