ME wanted a stupid amount of $$ to convert several of their molds I had to conventional format after I sold my Master Caster. I don't remember the amount ($70??), but it was out of line.
I discovered that LEE handles work perfectly. You'll need to find your own socket head cap screw thru bolts (#8?) to hold the handles, and some lock nuts to keep all together.
Then I found a sprue plate kit from Accurate Molds for $28 per mold set. Thoughtfully designed, well made and worth every penny.
So I converted my three ME molds for the price of the handles and the sprue kit each. Probably in the $48 price range per mold if you want to keep the handles mounted on the mold blocks. Works great.
Accurate Molds LLC
PO BOX 315
Salt Lake City, UT 84110
tom@accuratemolds.com
https://accuratemolds.com/