The phrase "available to replace a" is correct and usable in written English.
It can be used when discussing options or alternatives that can take the place of something else.
Example: "We have several candidates available to replace a team member who is leaving."
Alternatives: "ready to substitute for a" or "on hand to take the place of a".
Not all philosophers of mathematics are convinced that Fieldian nominalizations are available to replace all scientific references to abstract mathematical objects.
However, the discipline is experiencing an outflux of senior systems engineers reaching retirement age with no ready source of systems engineers available to replace them, at a time when the demand for systems engineers is increasing (NDIA, 2010).
But no other currency is available to replace the dollar, and the idea of a basket of different currencies is doomed.
The company said it had closed two new, long-term revolving credit agreements, making a total of $10 billion available, to replace two bank debts maturing later this year.
The standard pizza base was thin and crispy, with a "cheesy bites" option available to replace the standard crust, with tasty individual cheesy dough balls.
But Nosten says he fears artemisinin combination therapies — known as ACTs, they involve treating a patient with artemisinin along with one other antimalarial drug — could become useless long before a new drug is available to replace them.
It would mean that a healthy heart had become available to replace the scarred, useless muscle in his chest.
Thus, phototrophic cell growth requires that a source of electrons be available to replace the electrons that are consumed during biosynthetic reactions.
For a variety of reasons, production of the D3A had been drastically reduced, while that of the B5N had been stopped completely and, as a consequence, there were none available to replace losses.
Curiously there is a well-defined RNA helix from 2427 to 2462, such that if one calculated the minimum free energy of the longer segment 2427 through 2650 there would be a third PTC base helix available to replace the L10e/L16 helical mimic.
