GOWE New Telescope Tube Rings with Dovetail mounting Plate 96.5mm : Amazon.ca: Tools & Home Improvement
iSTAR adapter with variable height from 70 - 105mm (Surphaser), 165,00 €
Astromania Bahtinov Mask Focusing Mask for Telescopes - FM100mm for a Tube Outer Diameter (OD) from 105mm-150mm - can be Mounted with The Brass Screws Inside or Outside The drawtube : Amazon.sg:
ASTRO-PHYSICS, INC
2-Way Telescope Tripod with 3D Safety Adapter, 1.499,00 €