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Nef-
More googling suggests the sizes a little flexible - which is helpful....
https://www.electricalengineering.xyz/sheet/resistor-power-rating-chart/
Based on this, I'd probably take a punt on 2W.
Scrabble
Measuring the resistor you have would make sense - more procrastinating means it seems a 1W resistor is 9x3.2mm and a 2W is 11.5x4.5mm.
https://www.ebay.co.uk/itm/100ohm-1M-ohm-Various-Value-Resistors-In-1W-2W-Power-5-Pack-of-5/231188935817?