Not completely sure on the newer models but on the 2010-2012 or so, the 450 pegs were about 5 or 10mm lower than the 250F pegs. Bolted right up and much cheaper than aftermarket pegs.
May be worth giving this company a call to see if the 2T and 4T peg mounts are identical...12mm lower is about all you'll get out of any option. Also, have you thought of going to a tall seat foam? Then you won't deal with your heels potentially hitting the ground/snagging ruts with the benefit of more leg room...
Might be the same between the yamaha models, just that they have not updated their website?
https://www.systemtechracing.com/product_p/55-04.htm
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