Hi there,
Yes, they are all the blue body, black end variety on my 450SL. (82, 83, and 34 on my chart - 35 is the thermostatically controlled valve on bottom of the control unit.) Performance Products item #80-011, $11.95 ea. 1-800-243-1220. If you call them they will send you a great Mercedes catalog, or you can order the parts over the phone. Phil on this forum may have them also, but his online catalog is weak so you may have to call him for price and availability if you want to order through him.

Regards,
Richard Wooldridge
'82 300D/4.3L V6
'79 450SL
'75 280C