Various length alphanumeric field with and without a dash - need to extract numbers

I'd assumed you might want to see the leading zeros.
Since you don't, try this slight variation:

B2: =INDEX(--RIGHT(LEFT(A1,FIND("-",A1&"-")-1),{3,2,2}),MATCH(1,--ISNUMBER(--RIGHT(LEFT(A1,FIND("-",A1&"-")-1)
,{5,4,3})),0))
or 
B2: =IFERROR(INDEX(--RIGHT(LEFT(A1,FIND("-",A1&"-")-1),{3,2,2}),MATCH(1,--ISNUMBER(--RIGHT(LEFT(A1,FIND("-",A1&"-")-1)
,{5,4,3})),0)),"")