Early Sprites, like our Bugeye project, had drum brakes all around, but fitting the disc brakes from a later car–a 1962 and newer Sprite or MG Midget–is quite straightforward.
You will need the calipers, spindles, kingpins and hubs. You might also want the brake rotor dust shields, bu…
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Any shop manual, and your comment here about not splitting the caliper unless it is leaking simply doesn't work for me. One of the first thingS I do when rebuilding these calipers, after I get the piston on the side opposite the bleeder free is to split the caliper. I am not and have not ever been a mechanic for a living so I can use the, possible, extra time it takes to split the caliper. It make rebuilding it so much easier, and in approximately 50 years of working on, restoring and racing these cars I have never had one leak after I rebuilt it. Moss does sell the seal(Fluid Channel Seal) that needs to be replaced between the halves, but unfortuneatly it is not included with the rebuild kit. They can be bought seperatly from Moss, part number 180-285.
I would either paint or powder coat the calipers. When painting them I use a VHT high temp exhaust header paint. Usually less expensive than specific caliper paint.