I have an Athearn 33.9k gallon LPG tank car that I would like to install Fox Valley Models metal replacement wheels. I know the couplers are McHenry, but am not sure what brand the trucks/wheels are to find the right replacement size. The FVM website does not include Athearn among the replacement brands, or at least I did notice it listed. Can someone advise on the correct FVM metal wheelset replacement number? The Athearn car is: N RTR 33.9K LPG Tank/Flat, UTLX/100th #910611 [ATH23529] Thank you!