Did you already pick up ARB's? We can definitely match up the ones you need. If the limited slip is the factory Toyota unit, non-issue, the ARB will fully replace that carrier in the 3rd member.
I've not closely compared the two different front bearing retainers (33131-60050 for the B & 33131-60040 for the F/H) nor tried to modify one for a LS. We have pallets of new F/H & 1HZ H55F's and split t-cases here in the shop so that generally drives my parts selection :D
We (Cruiser Outfitters) stock the F/H H55F input shaft loose should you choose to go that route too... the issue would be the input nose cone. Also possible to run your existing transmission with a spacer on the adapter bellhousing and a 21 spline clutch.
Any of the Advance Adapters to LC transmission kits are going to utilize the F/H variant H55F as it's identical splines and length as a US 4spd. So for the LS to F/H variant H55F you just use a LS to 4spd kit. Advance Adapters website even lists the 5 spd to Chevy LS kits specifically. I've not...