Custom made from Nylon 12 my Schimmel Engineering in the U.S.A. No longer available from Mercedes!
These have been unavailable for a long time, leaving 450 engine owners with the only option to use there old ones or try to finds some good used ones on eBay.
1976 to 1980 450 V8 Fuel Injector Holders Set of 8
$148.80
SKU:
GEG-450INJHOLDERS 
Product Details
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$284.50
1976 to 1980 450SL 450SE 450SEL Fuel Injector Replacement Kit
Includes GENUINE Bosch fuel injectors, new holder seals, cleaning supplies, and video instructions. ( Plastic injector holders no longer included NLA )
PLEASE READ BEFORE ORDERING: The plastic injector holders are no longer availabe. The video instructions will show we include them in the kit so PLEASE disregard. You will have to use your old holders and install the new green seals we include.