14t with sandman case saver

I'm looking at needing a new set of sprockets chain and chain guard ASAP. I would also like to put on a sandman case saver but am wondering if anyone has put one one with a 14t front... Will it fit without contact or do I need to stay with the front. I was also looking for that chart that says the duffent speeds or gear ratios for our wr's with each gear set? I would like to stay close to the stock gearing with the 14 front so want to figure out what rear I want? Thinking maybe a 45.
Thanks

It's just some math:

WR-250R stock sprockets have 13 and 43 teeth.
43 divided by 13 = 3.307

The ratio of the stock WR-250R sprockets is 3.307, which means the rear sprocket has 3.307 times as many teeth that the front sprocket has.

If you want to get as close as possible to that 3.307 ratio with a 14-tooth front sprocket, you need a 47-tooth rear sprocket:

47 divided by 14 = 3.357

14 tooth works just fine with sandman cover.