The US MS sections are shorter that the Canadian ZA sections. The MS116,7,8 are about 39". The WS19 bits are just under 50". You can always add an additional section. I think on both you can go up to 5 sections without to much stress on the bottom aerial. I found all three ws19 sections, ZA/Can0699,0700,0701 and an aerial bag No.2 MK2 at a thrift store for $10. It was in with the fishing gear.
Fair Radio has some MS stuff but not as cheap as Haney Electronics. Another good source are the MVPA meets.