Try to locate a Churchill, Cogswell & Harrison or Parker-Hale chequered sporter stock set for your particular rifle [essentially either a #1 Mk. III or a #4 will fit 99% of the sporterized Lee Enfields; if you've got a P14 (a #3), then there are fewer options out there, but they're still around.
Any lace-on cheek pieces / comb risers I've ever seen were all still way too low when attached to a 303 military stock, whatever the flavour.