Pivot Pegz - Very well made, pivot, wider and very expensive. �160
SW Motech - Wider, longer, removable rubbers and adjustable for height. �100 (I've got these and have been very impressed. Good value and comfy.)
Cheap footrests for Yamaha YZs from the 90s sourced from ebay - Not hugely bigger than stock, but cheap as chips. �30
Touratech - Nice looking, but you don't get much for your money and you need to buy adaptors to fit. Expensive. �150
The last option is to weld extensions and/or wider platforms to your existing pegs, or perhaps even bolt-on extensions if you haven't access to a welder? �0