Trying to ID turbos NOS

[leonpotgieter]

Hi to all

I am trying to figure out what turbo these are. I was told they are 935 but I am not yet convinced. They have a date stamp for 1984.
Both are Model K26
Serial 85 681 1604 and 85 681 1601
3k Part number 5326 999 1053 and the same 5326 999 1053

I know the following so far, the 999 in part number means racing.
other cars that used K26 turbo part numbers that came close are
Porsche 944 Turbo S2 K26, 5326 970 6720
Porsche 924 Carrera GT K26, 5326 970 6023
Porsche 924 Turbo K26, 5326 980 7007