I've never had to do it but people usually use white plastic for-sale signs to extend their sides. Doesn't seem too difficult.
SCTrooper asked me to measure my RT shins
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Mine are 15 5/8" (39.687 cm) long of the front side of the shin.
How long are your ATA, TE2, TM or AP?
Also... If Paul is reading this... How long are the XL TM shins?
Aloha,
-Eric