I took my chuck with me to Lowes and found one that worked. Will look at see if it has a number or something on it. But I did find one that fix the check off of one of the ER's I picked up.
Broken Arrow OK
MKV, 510, MKVll, 50th Anniversary 520 with Jointech saw train, Bandsaw, scroll saw, joiner, 6" Sander,Stand Alone Pin Router and Router Table, Strip Sander, Jigsaw & (4) ER's plus Jigsaw for ER. DC SS RAS