if you are going to bother upgrading the dogs/spikes.... get these.
don't even mess around with the factory 355t crap
https://www.ebay.com/itm/ECHO-CS-330T-360T-361T-355T-350T-CS-2511T-CHAINSAW-BUMPER-DOG-SPIKE/362855112636?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649