PET 115-05 #(11) E 039 119 353 air duct floor, L qty:1
EC0 037 552>>
GC0 000 001>>

these look like engine serial numbers starting in MY 1975

related:
039.119.354 right side MY 1975-6
022.119.355 right side >>MY 1974
022.119.356 A left side >>MY1972
022.119.356 B left side MY 1973-4