Based on orthology to human genes, the following genes are likely to be components of the D.mel mitochondrial ribosome:
( Note:research  publications supporting the mitochondrial ribosome subunit assignment of the human ortholog are also listed.)
Small mitochondrial ribosome subunit:
CG4882, FBgn0025336; Human  otholog:MRPS27 , HGNC:14512 (PMID:22841715)
CG12848, FBgn0040666; Human  otholog:CHCHD1  (aka MRPS37), HGNC:23518 (PMID:23908630)
Ptcd3, FBgn0033816; Human  otholog:PTCD3  (aka MRPS39), HGNC:24717 (PMID:19427859, PMID:23908630)
Large mitochondrial ribosome subunit:
CRIF, FBgn0037102; Human  otholog:GADD45GIP1  (aka MRPL59, CRIF1), HGNC:29996 (PMID:25278503, PMID:23908630)
CG6094 (FBgn0032261); Human  otholog:MRPL58  (aka ICT1), HGNC:5359 (PMID:25278503, PMID:20186120, PMID:23908630)
CG14817, FBgn0026089; Human  otholog:MRPL57  (PMID:28892042)
mRpS30, FBgn0030692; Human  otholog:MRPS30 *, HGNC:8769 (PMID:28892042, PMID:25278503)
*MRPS30 was originally classified as a component of the small subunit. It has kept its gene symbol, but in UniProtKB the protein is named 'Large ribosomal subunit protein mL65' (UniProt:Q9NP92) and is an acknowledged component of the large subunit and not the small (PMID:25278503).
Dual membership:
mRpS18A, FBgn0051450; Human  ortholog:MRPS18A **, HGNC:14515 (large subunit: PMID:28892042, PMID:25278503; small subunit: PMID:11279123, PMID:25838379, PMID:27023846).
**MRPS18A is thought to be a component of both subunits (PMID:25278503). It was originally assigned to the small subunit. It has kept its gene symbol, but in UniProtKB the protein is named 'Large ribosomal subunit protein mL66' (UniProt:Q9NVS2).