Anyone know what Selkirk stove pipe adapter fits Harman P38+?? before I purchase one, online or try locally. Apparently it has a 3" Thick collar, the one in the Up and Out Kit,3VP-PC ,just short of fitting around the collar. It's either 3VP-TPC 243242 thick collar connector or 3VP-APC 243243 adjust connector. Hard to find Selkirk dealer around me, all Simpson. PIA Thanks.