These might be answers.
For Porsche 911 type 996 / 997 2001-2008, Boxster / Cayman 986 / 987 2001-2008:
PN 996-105-180-58, with big external spring,
https://lufteknic.myshopify.com/products/timing-chain-tensioner-crankshaft-to-ims-porsche-911-996-997-boxster-cayman-99610518058
For Porsche 911 type 996 1999-2000, Boxster type 986 1997-2000;
PN 996-105-180-59, without the spring.
https://lufteknic.myshopify.com/products/timing-chain-tensioner-crankshaft-ims-porsche-911-996-boxster-986-99610518057
CK