Scott 4500psi 45 min scba bottle

Ebay is your friend. Tons of options.
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You need:

  1. Tanks (you have)
  2. Regulator valve assembly (CGA-347 valve) for each. You can get these all day on Ebay from $30-$100 depending on how new you want it. (Shamboozi has the valve assembly post above off Ebay)
  3. A fill system I suggest the Stickman & Cascade man combo kit from Air Tanks Plus. So you can cascade fill with both tanks. The link is below:
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    https://airtanksplus.com/product/stikman-cascade-man-combo-kit/