Converting a Backhoe bucket?

I'm looking for backhoe buckets that will fit mine, the issue is a lot of the buckets have tapered ears.
The front set of ears normally are fine - 8-10" from ear to ear, but the back ones seem to be normally 5-1/2" apart.
Is there any way I could make it fit on mine?

First image: my NH Lb75.b tractor with a 30" bucket,
Second image: 10" bucket with back set of ears spaced at 5-1/2"

Converting a Backhoe bucket?