Looking for more info on a 105th Anti-Tank Regiment Archer, "Defiant"

Hi all,

In KevinT 's amazing spreadsheet of vehicle names, there is a line item for "Defiant" being used on S279970 which was an Archer in 314th Battery, 105th Anti-Tank Regiment. (Which was in 5th Army in Italy.)

I am wondering if anyone would happen to have the source material for this entry? I have the war diary for the regiment, at least the essential bits, so I don't know if this was just in a bit of "bumf" that I don't have?