No problem, it should fit well,.. but like mentioned you might want to find a way to keep it in place. Mine just sits there nicely.
http://www.ebay.com/itm/Vw-Mk1-Jetta-Rabbit-Caddy-Turbo-Diesel-SILICONE-Intake-Air-Manifold-Hose-Kit-/270821249179?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f0e34509b&vxp=mtr#ht_3407wt_916http://www.ebay.com/itm/VW-Mk1-Rabbit-Caddy-Jetta-Pickup-Golf-1-6-Turbo-Diesel-Snorkel-Air-Intake-Hose-/270821213651?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f0e33c5d3&vxp=mtr#ht_2075wt_916I make these for Mk1I used a cone K&N filter with a s/s sleeve first until I found a MK1 airboxI hope this helps