Empi:
https://www.vwheritage.com/shop/AC1297401/empi-34-epc-carb-kit-t1-2-sp/" onclick="window.open(this.href);return false;
Or Weber:
https://www.vwheritage.com/shop/AC129K1401/weber-34-ict-carb-kit-t1-2-sp-or-use-ac1297401/" onclick="window.open(this.href);return false;
Both good kits,
I haven't tried to PEP up a 1500SP so cant give you any opinions on whether it is worth it or not.