I have two questions about the thermostat and its cover for a 1997 E320 (104 engine). Thanks in advance.

1. What size of star socket is needed to remove the cover? I found these are not hex bolts but with star heads.

2. Will a thermostat for the W124 (90 300E) fit this car? I found in a store catalog that both the W124 and W210 share the same thermostat number but MB has two different parts numbers.

Bo