I’d just get a grip tech one.
Or an RR if you can find it
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FS New in box: GripTec® 3.25" 8 Rib Whipple Cobra L3 Black Pulley
Still liquidating parts from a project I moved on from. GripTec 4 bolt pulley for Whipple, 3.25" diameter. New in box $120 Shipped paid by Venmo or PP Info: https://www.zpegriptec.com/3-25-8-rib-whipple-l3-black-cobra/ Part# WA325BB3Z8 Ultra Lightweight Pulley Whipple Cobra kits. Made...svtperformance.com