WE REQ NTC thermistors of specs: 1] epoxy coated bead with R @25 DEG C =2200 OHMS AND R @ 100 DEG C =149. 18 OHMS[range upto 120 deg c + -2% . B value 25 / 85 =3977k + -1% BEAD DIA =2. 6 mm. Lead wire =40 mm length, teflon coated with stripped end to be 5 mm. 2] washer type thermistor with hollow inside dia of 3. 30to 3. 40 mm B value =4206k, R @25 deg c =21. 2 + -1% R@50 deg c =187 to 237 ohms. Thickness=1. 40 to 1. 60mm, Width =5. 0 to 5. 3 mm