Located Crossword & Puzzle Collection Stinker 143 Aug/Sep

Needing help with 2 to finish this stinker!

145A. Praticable ???S?B?E (could be Feasible or Possible)
141D. Boundary Markers ???S (second letter could be ‘O’ or ‘E’ depending on which answer is chosen for 145 A)

(Last letter S from 154A. Lack of luxuries = AUSTERITY

Thanks in advance!