MF, Mitre10 do stock quite a few masport silver range and one red. the boxer on the left has the quickcut bar and takes bnc5345, the 2 different 18in (flat front) ones both take bnc3237.
If they were 19in, the flat round discs would take BNC8445. Quickcuts generally aren't used on 19in but if they were you would use BNC6503
The curved shape carrier is the quadcut vacuum disc - having run one without blades just to see, i can confirm it makes decent suction on its own (same as having a 80% worn 2 blade disc - a bit of vacuum but not a tonne. This strength proves to be its undoing - its blades can be fairly shot and it will still half catch alright. With the blades worn and the disc picking up and throwing the grass, the divots in it build up with grass. this unbalances the disc and cracks it.
On 18in with these quad cuts, use 2x bnc5345 and on 19in use BNC6503
Then there is the 18in heavy duty chassis that looks identical to the 19in but is actually an 18... confusing hey haha
Norm, yes havent seen a cracked disc in a good while - I do reckon they changed the carbon content in the steel though as I am seeing more with rounded blade holes
