AMDEP's DM3500's are fully reserved. There are no spares
available for 57 or 58. If there any Mk IV's on these services,
they're most likely to come from ARBP (not likely given tat most
went to 48 ) or BNDEP.
In any case, AMDEP buses won't dominate these services. It's likely
to be joint BNDEP/AMDEP and AMDEP/ARBP, given the supply of SP
buses available.
Thus, you'll most likely to see a combination of Mk III and Merc on
these 2 services, and also Scanias and Mk IV's on 58.