Here are your choices, from the game files.
Slot 1
mechdef_blackjack_BJ-1,Mech,1,4
mechdef_vindicator_VND-1R,Mech,1,3
mechdef_centurion_CN9-A,Mech,1,2
mechdef_enforcer_ENF-4R,Mech,1,2
Slot 2
mechdef_blackjack_BJ-1,Mech,1,1
mechdef_vindicator_VND-1R,Mech,1,4
mechdef_centurion_CN9-A,Mech,1,3
mechdef_enforcer_ENF-4R,Mech,1,2
Slot 3
mechdef_commando_COM-1B,Mech,1,2
mechdef_commando_COM-2D,Mech,1,2
mechdef_jenner_JR7-D,Mech,1,4
mechdef_panther_PNT-9R,Mech,1,4
Slot 4
mechdef_commando_COM-1B,Mech,1,2
mechdef_commando_COM-2D,Mech,1,2
mechdef_spider_SDR-5V,Mech,1,4
mechdef_firestarter_FS9-H,Mech,1,4
mechdef_cicada_CDA-2A,Mech,1,1
mechdef_cicada_CDA-3C,Mech,1,1
Slot 5
mechdef_locust_LCT-1M,Mech,1,1
mechdef_locust_LCT-1S,Mech,1,1
mechdef_locust_LCT-1V,Mech,1,1
mechdef_urbanmech_UM-R60,Mech,1,3
mechdef_spider_SDR-5V,Mech,1,2
mechdef_commando_COM-1B,Mech,1,1
mechdef_commando_COM-2D,Mech,1,1
@ Kiva, Can I assume the numbers at the end affect the "Random chance" factor ie higher number, lower chance? Also can we add anything to those lists or is there a limit?
Oh, re read Kiva's post, I was actually digging this out before Kiva posted. Your most common lance has the highest chances so I assume the higher the number in the second position then the higher the chance of getting the mech, Ie the Urbie in Slot 5 has 3 out of 10 chances to be picked.
Is this correct?