This kit includes new old stock parts, which we are also using in our own pre-built RE-303s:

• 3 x Mitsubishi 2sc1583 (F or G depending on items in stock)
• 1 x Mitsubishi 2sc2291 (F or G depending on items in stock)
• 10 x NEC 2sa733ap
• 27 x NEC 2sc945p or Sanyo 2sc536f or Toshiba 2sc1815gr (leave a message at your order which type you'd like, all 3 of them have been used in TB-303s)
• 1 x Toshiba 2sk30a-o
• 1 x Toshiba 2sk30a-y
• 1 x Sanyo LA4140
• 2 x Panasonic AN6562
• 1 x NEC RD6.8EB3
• 1 x NEC RD15EB3
• 8 x Rohm 2sc2021r

The potentiometer guide is used to improve the tweaking experience by stabilizing the potentiometers. It comes with pre-fitted double sided adhesive tape to conveniently mount it on the bottom side of the faceplate of your RE-303.