I just got a batch of 100 venturis back from the plater. They fit the Magnum XLS 15A, and its ASP brother (or anything else with a 10 mm throat). Per Sportsman Goodyear rules, the venturi bore is reamed 1/4". The venturis are anodized dark blue to match the cylinder head. $10.00 each plus $3.00 postage per order (USA).
I also have RSM Supertigre style needle valve assemblies to fit the venturi for $10.00 each. In addition, I have tanks, landing gear, and other Sportsman Goodyear parts and accessories. Send me a PM, or find me at the racing circle at the NATS!
Bill Bischoff